Midrash for Chullin 264:40
כי הא דרבא קניס אטמא רב נחמן בר יצחק קניס גלימא
- The law, however, is not in accordance with him.
Sifrei Devarim
"from the people": and not from others (i.e., gentiles), and not from his fellow Cohanim.
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