Reference for Chullin 261:38

(דברים כד, כא) כי תבצור כרמך לא תעולל אחריך אמר ר' לוי

The other priestly dues, such as the shoulder and the two cheeks and the maw, are not exacted from one priest in favour of another priest nor from one Levite in favour of another Levite.<span class="x" onmousemove="('comment',' Tosef. Pe'ah II. The Gemara proceeds first to interpret this Baraitha, proving the Biblical source for each of these gifts to the poor, and later on reverts to the objection raised by R. Idi against R. Papa. kkgu, tk ,ukkug yrp');">²⁹</span>

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