Reference for Pesachim 177:1

משום דאיכא חזה ושוק דכהנים הוא דאכלי ליה

because there is the breast and the shoulder [of the peace offering], which is eaten by priests [only].<span class="x" onmousemove="('comment',' And since it may be a Passover sacrifice and no priests are registered for this, they cannot eat it.');">¹</span>

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