Difference between revisions of "Purpose of the Trumpet Blowing/2"

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<p>The trumpets served a purely practical function, signalling the nation to gather for various purposes.</p>
 
<p>The trumpets served a purely practical function, signalling the nation to gather for various purposes.</p>
 
<mekorot>perhaps R. Saadia Gaon, perhaps <multilink><a href="RashiRoshHaShanah26b" data-aht="source">Rashi</a><a href="RashiRoshHaShanah26b" data-aht="source">Rosh HaShanah 26b</a><a href="R. Shelomo Yitzchaki (Rashi)" data-aht="parshan">About R. Shelomo Yitzchaki</a></multilink></mekorot>
 
<mekorot>perhaps R. Saadia Gaon, perhaps <multilink><a href="RashiRoshHaShanah26b" data-aht="source">Rashi</a><a href="RashiRoshHaShanah26b" data-aht="source">Rosh HaShanah 26b</a><a href="R. Shelomo Yitzchaki (Rashi)" data-aht="parshan">About R. Shelomo Yitzchaki</a></multilink></mekorot>
<point><b>"וְהָיוּ לְךָ לְמִקְרָא הָעֵדָה וּלְמַסַּע אֶת הַמַּחֲנוֹת"</b> – According to this approach, this sentences serves as a heading for all of verses 2-10, and not just verses 2-7.&#160; Each of the four cases mentioned (and not just the first two where the verses are explicit) is an assembling to either gather or travel.<fn>This is obvious with regards to the first two cases which are explicitly about assembly or travel. The points below discuss how this approach reads the blowing of trumpets during times of war and holidays in a similar fashion.</fn></point>
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<point><b>"וְהָיוּ לְךָ לְמִקְרָא הָעֵדָה וּלְמַסַּע אֶת הַמַּחֲנוֹת"</b> – According to this approach, this sentences serves as a heading for all of verses 2-10, and not just verses 2-7.&#160; Each of the four cases mentioned (and not just the first two where the verses are explicit) is an assembling to either gather or travel:<br/>
<point><b>Trumpets in times of war</b> – In times of war, the trumpets played a functional role, serving to announce the state of war so that the troops would gather and head to battle.</point>
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<ul>
<point><b>Trumpets and the sacrificial service</b> – It is possible that during the wilderness period trumpets were blown to signal the people to gather near the Mishkan (or, perhaps, stand still by their tents)<fn>If so, it would function like the sirens in Israel during Holocaust Remembrance Day or Memorial day which signal the nation to pause and stand in silence.</fn> at the hour when communal sacrifices were offered.&#160; Even after arrival in Israel, when this was no longer practical, the custom of blowing was maintained to mark the ideal that everyone participate in such communal sacrifices.</point>
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<li><b>War</b> – In times of war, the trumpets played a functional role, serving to announce the state of war so that the troops would gather and head to battle.</li>
<point><b>"נִזְכַּרְתֶּם לִפְנֵי י״י אֱלֹהֵיכֶם וְנוֹשַׁעְתֶּם מֵאֹיְבֵיכֶם"</b> – If the trumpet blowing had no religious significance, as this position maintains, this verse is somewhat difficult. Why should a technical call to war elicit Hashem's mercy? These sources might suggest that the remembering of the nation is not a direct result of the trumpet blowing at all and is mentioned in this context only due to the discussion of battle, to reassure the nation that Hashem will remember and aid them whenever they go to war.</point>
+
<li><b>Sacrificial service</b> – This approach might suggest that during the wilderness period trumpets were blown to signal the people to gather near the Mishkan (or, perhaps, stand still by their tents)<fn>If so, it would function like the sirens in Israel during Holocaust Remembrance Day or Memorial day which signal the nation to pause and stand in silence.</fn> at the hour when communal sacrifices were offered.&#160; Even after arrival in Israel, when this was no longer practical, the custom of blowing was maintained to mark the ideal that everyone participate in such communal sacrifices.</li>
<point><b>"וְהָיוּ לָכֶם לְזִכָּרוֹן לִפְנֵי אֱלֹהֵיכֶם"</b> – This verse is similarly difficult.&#160; This position might explain that the subject of the phrase "<b>וְהָיוּ</b> לָכֶם לְזִכָּרוֹן" is the sacrifices themselves, not the accompanying blowing of trumpets. It is the sacrificial service which will be remembered by Hashem, not the technical signal to gather.</point>
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</ul></point>
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<point><b>"נִזְכַּרְתֶּם לִפְנֵי י״י אֱלֹהֵיכֶם וְנוֹשַׁעְתֶּם מֵאֹיְבֵיכֶם"</b> – If the trumpet blowing had no religious significance, as this position maintains, this verse is somewhat difficult. Why should a technical call to war elicit Hashem's mercy? These sources might suggest that the remembering of the nation is neither a goal nor a direct result of the trumpet blowing. It is mentioned in this context only due to the discussion of battle, to reassure the nation that Hashem will remember and aid them whenever they go to war.<fn>As such, it might be similar to other promises of Hashem's aid found in other discussions of entry into the land.</fn></point>
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<point><b>"וְהָיוּ לָכֶם לְזִכָּרוֹן לִפְנֵי אֱלֹהֵיכֶם"</b> – This verse is similarly difficult. This position might explain that the subject of the phrase "<b>וְהָיוּ</b> לָכֶם לְזִכָּרוֹן" is the sacrifices themselves, not the accompanying blowing of trumpets. It is the sacrificial service which will be remembered by Hashem, not the technical signal to gather.</point>
 
<point><b>תרועות vs. תקיעות</b> – The two sounds distinguished whether the people were being called to gather<fn>This includes assembly either due to Moshe's call or for the sacrificial service.</fn> or to travel.<fn>This would include travel in the wilderness or for purposes of war.</fn> It is possible that the broken sound of the<i> teruah</i> reflects movement, and was therefore chosen as its signal, while the united blast of the <i>tekiah</i> better matches a gathering in one place.<fn>See <multilink><a href="HaKetavVeHaKabbalahBemidbar10-7" data-aht="source">Haketav VeHaKabbalah</a><a href="HaKetavVeHaKabbalahBemidbar10-7" data-aht="source">Bemidbar 10:7</a><a href="R. Yaakov Mecklenburg (HaKetav VeHaKabbalah)" data-aht="parshan">About R. Yaakov Mecklenburg</a></multilink> and R. Hirsch who explain the etymology of the words, showing how the meaning of each matches its sound and function. The word "" stems from the root "תקע", meaning to thrust or drive into, causing things to stick together, appropriate for gathering.&#160; Teruah, on the other hand, comes from the root "רעע", meaning to break, appropriate for movement..</fn></point>
 
<point><b>תרועות vs. תקיעות</b> – The two sounds distinguished whether the people were being called to gather<fn>This includes assembly either due to Moshe's call or for the sacrificial service.</fn> or to travel.<fn>This would include travel in the wilderness or for purposes of war.</fn> It is possible that the broken sound of the<i> teruah</i> reflects movement, and was therefore chosen as its signal, while the united blast of the <i>tekiah</i> better matches a gathering in one place.<fn>See <multilink><a href="HaKetavVeHaKabbalahBemidbar10-7" data-aht="source">Haketav VeHaKabbalah</a><a href="HaKetavVeHaKabbalahBemidbar10-7" data-aht="source">Bemidbar 10:7</a><a href="R. Yaakov Mecklenburg (HaKetav VeHaKabbalah)" data-aht="parshan">About R. Yaakov Mecklenburg</a></multilink> and R. Hirsch who explain the etymology of the words, showing how the meaning of each matches its sound and function. The word "" stems from the root "תקע", meaning to thrust or drive into, causing things to stick together, appropriate for gathering.&#160; Teruah, on the other hand, comes from the root "רעע", meaning to break, appropriate for movement..</fn></point>
<point><b>Biblical parallels</b></point>
 
 
<point><b>Why limited to priests?</b> Given the purely functional nature of the trumpet blowing, it is not clear why only priests were allowed to blow the instrument.</point>
 
<point><b>Why limited to priests?</b> Given the purely functional nature of the trumpet blowing, it is not clear why only priests were allowed to blow the instrument.</point>
 
<point><b>Placement of the unit</b> – As the trumpets are not considered holy vessels it is understandable why they are not mentioned as part of the vessels constructed with the Mishkan.&#160; They are mentioned now since the nation is about to begin their travels, necessitating their use.</point>
 
<point><b>Placement of the unit</b> – As the trumpets are not considered holy vessels it is understandable why they are not mentioned as part of the vessels constructed with the Mishkan.&#160; They are mentioned now since the nation is about to begin their travels, necessitating their use.</point>
 +
<point><b>Biblical parallels</b></point>
 
<point><b>Why was their trumpet blowing only for the first two camps?</b> This position might agree with <multilink><a href="BaraitaDeMelekhetHaMishkan13" data-aht="source">Baraita DeMelekhet HaMishkan</a><a href="BaraitaDeMelekhetHaMishkan13" data-aht="source">13</a><a href="Baraita DeMelekhet HaMishkan" data-aht="parshan">About Baraita DeMelekhet HaMishkan</a></multilink> that, despite the silence in the text, trumpets were blown to signal each of the four camps to march. <multilink><a href="RambanBemidbar10-6" data-aht="source">Ramban</a><a href="RambanBemidbar10-6" data-aht="source">Bemidbar 10:6</a><a href="R. Moshe b. Nachman (Ramban, Nachmanides)" data-aht="parshan">About R. Moshe b. Nachman</a></multilink> suggests that this is implied by the phrase "תְּרוּעָה יִתְקְעוּ לְמַסְעֵיהֶם", explaining it to mean, "שיתקעו כן לכל מסעיהם".</point>
 
<point><b>Why was their trumpet blowing only for the first two camps?</b> This position might agree with <multilink><a href="BaraitaDeMelekhetHaMishkan13" data-aht="source">Baraita DeMelekhet HaMishkan</a><a href="BaraitaDeMelekhetHaMishkan13" data-aht="source">13</a><a href="Baraita DeMelekhet HaMishkan" data-aht="parshan">About Baraita DeMelekhet HaMishkan</a></multilink> that, despite the silence in the text, trumpets were blown to signal each of the four camps to march. <multilink><a href="RambanBemidbar10-6" data-aht="source">Ramban</a><a href="RambanBemidbar10-6" data-aht="source">Bemidbar 10:6</a><a href="R. Moshe b. Nachman (Ramban, Nachmanides)" data-aht="parshan">About R. Moshe b. Nachman</a></multilink> suggests that this is implied by the phrase "תְּרוּעָה יִתְקְעוּ לְמַסְעֵיהֶם", explaining it to mean, "שיתקעו כן לכל מסעיהם".</point>
 
<point><b>Modern equivalents</b> – This position's understanding of the trumpet calls in Tanakh can be compared to the role played by bugle calls in the army, where different sounds signal troops to &#160; assemble, return to quarters, stand at attention, charge, etc.</point>
 
<point><b>Modern equivalents</b> – This position's understanding of the trumpet calls in Tanakh can be compared to the role played by bugle calls in the army, where different sounds signal troops to &#160; assemble, return to quarters, stand at attention, charge, etc.</point>
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<li><b>Sacrificial service</b> – As sacrifices were offered and Hashem's presence descended to accept them, trumpets were blown in greeting.</li>
 
<li><b>Sacrificial service</b> – As sacrifices were offered and Hashem's presence descended to accept them, trumpets were blown in greeting.</li>
 
</ul></point>
 
</ul></point>
<point><b>Biblical parallels</b> – This understanding of the trumpet's function is supported by other verses which similarly speak of honoring Hashem as one would a human king,<fn>See&#160;<a href="MelakhimII11-14" data-aht="source">Melakhim II 11:14</a> for an example in Tanakh of blowing trumpet sin front of human kings.</fn> through trumpet calls.&#160; The idea is expressed most explicitly in <a href="Tehillim98-6" data-aht="source">Tehillim 98:6</a>, "בַּחֲצֹצְרוֹת וְקוֹל שׁוֹפָר הָרִיעוּ לִפְנֵי הַמֶּלֶךְ י״י". See also&#160;<a href="DivreiHaYamimI13-8" data-aht="source">Divrei HaYamim I 13:8</a>, <a href="DivreiHaYamimI15-24" data-aht="source">15:24</a> and <a href="DivreiHaYamimI16-6" data-aht="source">16:6</a> which speak of trumpets being blown in the presence of the Ark.</point>
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<point><b>Biblical parallels</b> – This understanding of the trumpet's function is supported by other verses which similarly speak of honoring Hashem through trumpet calls&#160; as one would a human king.<fn>See&#160;<a href="MelakhimII11-14" data-aht="source">Melakhim II 11:14</a> for an example of blowing trumpets in front of human kings. Elsewhere (Shemuel II 15:6, Melakhim I 1:39, and 9:13) verses similarly speak of the blowing of a shofar upon a king's coronation.</fn> The idea is expressed most explicitly in <a href="Tehillim98-6" data-aht="source">Tehillim 98:6</a>, "בַּחֲצֹצְרוֹת וְקוֹל שׁוֹפָר הָרִיעוּ לִפְנֵי הַמֶּלֶךְ י״י". See also&#160;<a href="DivreiHaYamimI13-8" data-aht="source">Divrei HaYamim I 13:8</a>, <a href="DivreiHaYamimI15-24" data-aht="source">15:24</a> and <a href="DivreiHaYamimI16-6" data-aht="source">16:6</a> which speak of trumpets being blown in the presence of the Ark.</point>
 
<point><b>"וְהָיוּ לְךָ לְמִקְרָא הָעֵדָה וּלְמַסַּע אֶת הַמַּחֲנוֹת"</b> – As this language&#160; implies that the trumpets were used<i> in order to</i> gather and travel (למסע); i.e. to facilitate these actions, Seforno must reinterpret the phrase, understanding it as if written, "<b>when</b> gathering or traveling" (<b>ב</b>נסוע המשכן).</point>
 
<point><b>"וְהָיוּ לְךָ לְמִקְרָא הָעֵדָה וּלְמַסַּע אֶת הַמַּחֲנוֹת"</b> – As this language&#160; implies that the trumpets were used<i> in order to</i> gather and travel (למסע); i.e. to facilitate these actions, Seforno must reinterpret the phrase, understanding it as if written, "<b>when</b> gathering or traveling" (<b>ב</b>נסוע המשכן).</point>
 
<point><b>"וְנִזְכַּרְתֶּם לִפְנֵי י״י אֱלֹהֵיכֶם" / "וְהָיוּ לָכֶם לְזִכָּרוֹן"</b> – This approach might suggest that it is the people's acknowledgement of Hashem's presence in their midst that leads to salvation.<fn>See Aviyah's words to Yerovam in <a href="DivreiHaYamimII13-13-15" data-aht="source">Divrei HaYamim II 13:12</a>, where he points out that Hashem's presence in their midst will lead Yehuda to victory</fn></point>
 
<point><b>"וְנִזְכַּרְתֶּם לִפְנֵי י״י אֱלֹהֵיכֶם" / "וְהָיוּ לָכֶם לְזִכָּרוֹן"</b> – This approach might suggest that it is the people's acknowledgement of Hashem's presence in their midst that leads to salvation.<fn>See Aviyah's words to Yerovam in <a href="DivreiHaYamimII13-13-15" data-aht="source">Divrei HaYamim II 13:12</a>, where he points out that Hashem's presence in their midst will lead Yehuda to victory</fn></point>
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<category>Prayer
 
<category>Prayer
 
<p>The blowing of trumpets functioned as part of the nation's prayer. As the nation went to war, the trumpets accompanied their cries for salvation, and when they returned home they accompanied their offerings of thanksgiving.</p>
 
<p>The blowing of trumpets functioned as part of the nation's prayer. As the nation went to war, the trumpets accompanied their cries for salvation, and when they returned home they accompanied their offerings of thanksgiving.</p>
<mekorot>perhaps <multilink><a href="IbnEzraBemidbar10-2-10" data-aht="source">Ibn Ezra</a><a href="IbnEzraBemidbar10-2-10" data-aht="source">Bemidbar 10:2-10</a><a href="R. Avraham ibn Ezra" data-aht="parshan">About R. Avraham ibn Ezra</a></multilink></mekorot>
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<mekorot>perhaps <multilink><a href="IbnEzraBemidbar10-2-10" data-aht="source">Ibn Ezra</a><a href="IbnEzraBemidbar10-2-10" data-aht="source">Bemidbar 10:2-10</a><a href="R. Avraham ibn Ezra" data-aht="parshan">About R. Avraham ibn Ezra</a></multilink><fn>Ibn Ezra suggests that all the cases of trumpet blowing in the unit relate to war, but does not explicitly address the purpose of each. In his comments to verse 9, he mentions the role played by the trumpets in awakening the nation to prayer so it is possible that he thinks this is consistently their purpose. However, it is also possible that he maintains that the trumpets played both a religious and practical role, serving also to signal the nation to gather for battle.</fn></mekorot>
 
<point><b>Common denominator</b> – Ibn Ezra maintains that there must be a common denominator<fn>According to Ibn Ezra, the fact that verse 8 states, "וְהָיוּ לָכֶם לְחֻקַּת עוֹלָם לְדֹרֹתֵיכֶם" implies that the laws discussed in the previous seven verses are applicable to the future as well.&#160; This leads him to conclude that all four cases mentioned in the unit must be similar.</fn> that unites all the cases in which trumpets are blown, leading him to suggest that they all relate to war:<br/>
 
<point><b>Common denominator</b> – Ibn Ezra maintains that there must be a common denominator<fn>According to Ibn Ezra, the fact that verse 8 states, "וְהָיוּ לָכֶם לְחֻקַּת עוֹלָם לְדֹרֹתֵיכֶם" implies that the laws discussed in the previous seven verses are applicable to the future as well.&#160; This leads him to conclude that all four cases mentioned in the unit must be similar.</fn> that unites all the cases in which trumpets are blown, leading him to suggest that they all relate to war:<br/>
 
<ul>
 
<ul>
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<point><b>Complement to the "כהן משוח מלחמה"</b> – The priests' role here might have complemented that of the anointed priest whose job it was to encourage the people as they left to war. One priest reassured the nation that Hashem was with him, while others led them in prayer.</point>
 
<point><b>Complement to the "כהן משוח מלחמה"</b> – The priests' role here might have complemented that of the anointed priest whose job it was to encourage the people as they left to war. One priest reassured the nation that Hashem was with him, while others led them in prayer.</point>
 
<point><b>"וּבְרָאשֵׁי חׇדְשֵׁיכֶם"</b> – The mention of "New Moons" as one of the times that trumpets are blown with the sacrificial service is difficult for this position, as it is hard to say that this refers to a celebration made on return from battle. This leads R"Y Bekhor Shor to suggest a different relationship between this insatnce of trumpet blowing and teh preceding ones.</point>
 
<point><b>"וּבְרָאשֵׁי חׇדְשֵׁיכֶם"</b> – The mention of "New Moons" as one of the times that trumpets are blown with the sacrificial service is difficult for this position, as it is hard to say that this refers to a celebration made on return from battle. This leads R"Y Bekhor Shor to suggest a different relationship between this insatnce of trumpet blowing and teh preceding ones.</point>
 +
<point><b>Why was their trumpet blowing only for the first two camps?</b> Ibn Ezra suggests that the trumpet blowing was limited to the first two camps</point>
 
</category>
 
</category>
 
<category>Changing Purpose
 
<category>Changing Purpose

Version as of 08:48, 1 June 2020

Purpose of the Trumpet Blowing

Exegetical Approaches

This topic has not yet undergone editorial review

Assembly

The trumpets served a purely practical function, signalling the nation to gather for various purposes.

Sources:perhaps R. Saadia Gaon, perhaps RashiRosh HaShanah 26bAbout R. Shelomo Yitzchaki
"וְהָיוּ לְךָ לְמִקְרָא הָעֵדָה וּלְמַסַּע אֶת הַמַּחֲנוֹת" – According to this approach, this sentences serves as a heading for all of verses 2-10, and not just verses 2-7.  Each of the four cases mentioned (and not just the first two where the verses are explicit) is an assembling to either gather or travel:
  • War – In times of war, the trumpets played a functional role, serving to announce the state of war so that the troops would gather and head to battle.
  • Sacrificial service – This approach might suggest that during the wilderness period trumpets were blown to signal the people to gather near the Mishkan (or, perhaps, stand still by their tents)1 at the hour when communal sacrifices were offered.  Even after arrival in Israel, when this was no longer practical, the custom of blowing was maintained to mark the ideal that everyone participate in such communal sacrifices.
"נִזְכַּרְתֶּם לִפְנֵי י״י אֱלֹהֵיכֶם וְנוֹשַׁעְתֶּם מֵאֹיְבֵיכֶם" – If the trumpet blowing had no religious significance, as this position maintains, this verse is somewhat difficult. Why should a technical call to war elicit Hashem's mercy? These sources might suggest that the remembering of the nation is neither a goal nor a direct result of the trumpet blowing. It is mentioned in this context only due to the discussion of battle, to reassure the nation that Hashem will remember and aid them whenever they go to war.2
"וְהָיוּ לָכֶם לְזִכָּרוֹן לִפְנֵי אֱלֹהֵיכֶם" – This verse is similarly difficult. This position might explain that the subject of the phrase "וְהָיוּ לָכֶם לְזִכָּרוֹן" is the sacrifices themselves, not the accompanying blowing of trumpets. It is the sacrificial service which will be remembered by Hashem, not the technical signal to gather.
תרועות vs. תקיעות – The two sounds distinguished whether the people were being called to gather3 or to travel.4 It is possible that the broken sound of the teruah reflects movement, and was therefore chosen as its signal, while the united blast of the tekiah better matches a gathering in one place.5
Why limited to priests? Given the purely functional nature of the trumpet blowing, it is not clear why only priests were allowed to blow the instrument.
Placement of the unit – As the trumpets are not considered holy vessels it is understandable why they are not mentioned as part of the vessels constructed with the Mishkan.  They are mentioned now since the nation is about to begin their travels, necessitating their use.
Biblical parallels
Why was their trumpet blowing only for the first two camps? This position might agree with Baraita DeMelekhet HaMishkan13About Baraita DeMelekhet HaMishkan that, despite the silence in the text, trumpets were blown to signal each of the four camps to march. RambanBemidbar 10:6About R. Moshe b. Nachman suggests that this is implied by the phrase "תְּרוּעָה יִתְקְעוּ לְמַסְעֵיהֶם", explaining it to mean, "שיתקעו כן לכל מסעיהם".
Modern equivalents – This position's understanding of the trumpet calls in Tanakh can be compared to the role played by bugle calls in the army, where different sounds signal troops to   assemble, return to quarters, stand at attention, charge, etc.

Show of Honor

The trumpets served to announce the presence of Hashem.  Just as trumpet calls herald the arrival of a human king, they honor and mark the appearance of Hashem. King of Kings, as well.

Holy or secular vessel – According to Seforno, the trumpets served a ceremonial rather than practical function.
Common denominator – According to this approach, the common denominator between all cases in which the trumpets are blown is that they involve the appearance of Hashem's presence:
  • Assembly – Seforno points out that gathering the nation required a trumpet call only because this took place in front of the Mishkan ("וְנוֹעֲדוּ אֵלֶיךָ...  אֶל פֶּתַח אֹהֶל מוֹעֵד"). As the people moved to stand near the Mishkan, Hashem's abode, trumpets were blown in His honor.
  • Travel – Trumpets were blown during travel due to the Mishkan's presence in the camp. Seforno points out that this explains why trumpets were only blown when the first two camps traveled. Since the Levites carrying the Mishkan and its vessels traveled only with these camps, trumpets accompanied their travels but not those of the last two camps.8
  • War – Since the the Ark and Hashem's Shekhinah accompanied the nation when they went to battle,9 trumpets were blown then as well.10 Here, too, it was Hashem's presence amidst the nation that prompted the trumpet call rather than the practical need for a signal to assemble the nation.
  • Sacrificial service – As sacrifices were offered and Hashem's presence descended to accept them, trumpets were blown in greeting.
Biblical parallels – This understanding of the trumpet's function is supported by other verses which similarly speak of honoring Hashem through trumpet calls  as one would a human king.11 The idea is expressed most explicitly in Tehillim 98:6, "בַּחֲצֹצְרוֹת וְקוֹל שׁוֹפָר הָרִיעוּ לִפְנֵי הַמֶּלֶךְ י״י". See also Divrei HaYamim I 13:8, 15:24 and 16:6 which speak of trumpets being blown in the presence of the Ark.
"וְהָיוּ לְךָ לְמִקְרָא הָעֵדָה וּלְמַסַּע אֶת הַמַּחֲנוֹת" – As this language  implies that the trumpets were used in order to gather and travel (למסע); i.e. to facilitate these actions, Seforno must reinterpret the phrase, understanding it as if written, "when gathering or traveling" (בנסוע המשכן).
"וְנִזְכַּרְתֶּם לִפְנֵי י״י אֱלֹהֵיכֶם" / "וְהָיוּ לָכֶם לְזִכָּרוֹן" – This approach might suggest that it is the people's acknowledgement of Hashem's presence in their midst that leads to salvation.12
Why limited to priests? As the trumpets played a religious role, it is logical that it is specifically the priests who were instructed to blow them.
Placement of the unit – If the trumpets were considered holy vessels, one might have expected that they be mentioned along with the other vessels of the Mishkan. This position might respond that as they are only secondary vessels, they are mentioned first here since it was only with the nation's travels and embarking to war that they were to be used extensively.
תרועות vs. תקיעות – As this position suggests that the trumpets served the same role throughout, and there was no need for distinct sounds to signal different actions, it is not clear why sometimes Hashem's presence is marked by a tekiah and at others by a teruah.13

Prayer

The blowing of trumpets functioned as part of the nation's prayer. As the nation went to war, the trumpets accompanied their cries for salvation, and when they returned home they accompanied their offerings of thanksgiving.

Common denominator – Ibn Ezra maintains that there must be a common denominator15 that unites all the cases in which trumpets are blown, leading him to suggest that they all relate to war:
  • "לְמִקְרָא הָעֵדָה וּלְמַסַּע אֶת הַמַּחֲנוֹת" – According to Ibn Ezra, the gathering and travel mentioned in verses 2-7 was not related to the wanderings in the wilderness, but to the imminent battle with Canaan. The nation was about to leave Sinai to begin the Conquest, as the end of the chapter attests, "‎וַיְהִי בִּנְסֹעַ הָאָרֹן וַיֹּאמֶר מֹשֶׁה קוּמָה י״י וְיָפֻצוּ אֹיְבֶיךָ"‎.16 It was for this war that they needed to assemble in formation.17
  • "כִי תָבֹאוּ מִלְחָמָה בְּאַרְצְכֶם" – This refers to future wars.
  • "וּבְיוֹם שִׂמְחַתְכֶם" – Ibn Ezra suggests that this verse refers to celebrations and holidays (like Purim) that were made to commemorate victories in battle.18
Trumpets and war: "וְנִזְכַּרְתֶּם לִפְנֵי י״י אֱלֹהֵיכֶם" – Ibn Ezra reads the verse as if written,"'וזכרתם את ה" (instead of the passive "וְנִזְכַּרְתֶּם") claiming that the trumpet calls in times of war served to remind the people to cry out to Hashem as they went to battle.19 Alternatively, one may suggest that the trumpets, whose cry induced fear and trembling, helped focus the people's prayer and repentance. It was this prayer that led them to be remembered by Hashem.20
Trumpets and sacrifices: "וְהָיוּ לָכֶם לְזִכָּרוֹן" – According to Ibn Ezra, just as the trumpets accompanied prayer before battle, they accompanied offerings of thanksgiving afterwards. Ibn Ezra might explain the words "וְהָיוּ לָכֶם לְזִכָּרוֹן" as he did the phrase "וְנִזְכַּרְתֶּם לִפְנֵי י״י": that the trumpet calls served to remind the people to offer their own prayers of thanksgiving. Alternatively, the purpose might have been to focus the people's attention or simply to make the offering more festive. If so, the statement ""וְהָיוּ לָכֶם לְזִכָּרוֹן" is not the goal of the trumpet blowing, but rather the result of the festive sacrifices.
Biblical parallelsDivrei HaYamim II 13:10-15 contains an explicit example in which trumpets were blown in battle as part of the nation's cries for salvation, "וַיִּצְעֲקוּ לַי״י וְהַכֹּהֲנִים [מַחְצְרִים] (מחצצרים) בַּחֲצֹצְרוֹת".  The next verse further describes how this did indeed lead to salvation, "וַיְהִי בְּהָרִיעַ אִישׁ יְהוּדָה וְהָאֱלֹהִים נָגַף אֶת יָרׇבְעָם". See also Divrei HaYamim II 20:27-28 which speaks of trumpet blowing during victory celebrations "בְיוֹם שִׂמְחַתְכֶם". Yehoshafat returns from battle "בְּשִׂמְחָה" and heads to the Mikdash (perhaps to offer sacrifices) "בַחֲצֹצְרוֹת".
"וְכִי תָבֹאוּ מִלְחָמָה בְּאַרְצְכֶם" – This language is somewhat rare in Tanakh, as we would have expected the verse to  state, "כִי תצא למִלְחָמָה" if referring to an offensive war, and  "כִי תָבֹא מִלְחָמָה בְּאַרְצְכֶם" if speaking of a defensive one.  If the verses are speaking first and foremost to the generation of the wilderness, though, the language is logical.  The nation is about to come (תָבֹא) to their land (בְּאַרְצְכֶם) to fight.21 Cf. Bemidbar 32:6, "הַאַחֵיכֶם יָבֹאוּ לַמִּלְחָמָה", where the same language is used in the context of embarking on the wars of conquest.
Why limited to priests? The priests specifically were tasked with the blowing since it served a religious function and not merely a technical one.
Complement to the "כהן משוח מלחמה" – The priests' role here might have complemented that of the anointed priest whose job it was to encourage the people as they left to war. One priest reassured the nation that Hashem was with him, while others led them in prayer.
"וּבְרָאשֵׁי חׇדְשֵׁיכֶם" – The mention of "New Moons" as one of the times that trumpets are blown with the sacrificial service is difficult for this position, as it is hard to say that this refers to a celebration made on return from battle. This leads R"Y Bekhor Shor to suggest a different relationship between this insatnce of trumpet blowing and teh preceding ones.
Why was their trumpet blowing only for the first two camps? Ibn Ezra suggests that the trumpet blowing was limited to the first two camps

Changing Purpose

The trumpets' role changed over time. While they served a purely practical purpose in the wilderness, in future generations they took on a ceremonial role