Midrash for Chullin 264:25
ולעביד ליה מר מיהת כר' אחא בר חנינא
R'Hisda said: A priest [a butcher] who does not give the dues [to another priest] is to be put under the ban of the Lord God of Israel.
Sifrei Devarim
"from the people": and not from others (i.e., gentiles), and not from his fellow Cohanim.
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