Midrash for Zevachim 46:8
יושב: מנלן אמר רבא אמר רב נחמן אמר קרא (דברים יח, ה) לעמוד לשרת לעמידה בחרתיו ולא לישיבה
Which uncleanness [is meant]? If we say, the uncleanness of a reptile?
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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