Midrash for Chullin 264:36
ואינו עושה לולב
R'Hisda also said: The [entire] shoulder is to be given to one [priest], the maw to another, and the two cheeks to two [priests].
Sifrei Devarim
"from the people": and not from others (i.e., gentiles), and not from his fellow Cohanim.
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