Midrash for Chullin 264:38
ואינו עושה מכין אותו עד שתצא נפשו
Rabbah B'Bar Hana said in the name of R'Johanan: It is forbidden to eat from an animal from which the priestly dues have not been taken.
Sifrei Devarim
"from the people": and not from others (i.e., gentiles), and not from his fellow Cohanim.
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