Midrash for Zevachim 46:5
לעולם בשרץ ושם טומאה בעולם
Hence it must mean uncleanness through a corpse, which proves that if the owners become unclean through a corpse they send their sacrifices. And of whom [is this said]?
Sifrei Devarim
(Devarim 18:5) "For in him (the Cohein) did the L-rd your G-d choose from all of your tribes to stand to serve in the name of the L-rd": We are hereby taught that his service is valid only standing, and if he sat and served, his service is invalid.
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