Purpose of the Service of Vayikra 16/2

The Service of Acharei Mot

Exegetical Approaches

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For the People

The main focus of the Avodah was to achieve Kaparah or Taharah for all of Klal Yisrael. Any part of the Avodah that has to do with Taharah of the Mikdash is just a means to the ends of Kaparah

Sources:Rashbam

For the Mikdash

The main focus of the Avodah is to purify the Mikdash from Tumah. All issues that deal with Kaparah are just a byproduct of rectifying the Tumah in the Mikdash.

For Both 

Both Taharah of the Mikdash and Kaparah for the people are essential to the Avodah and are equally driving the service of Yom Kippur.