Midrash for Chullin 259:8
חוץ מן הבכור ומן המעשר
ARE SUBJECT TO THE LAW OF THE FIRSTLING<span class="x" onmousemove="('comment',' And if they now bear a male firstling, even though the animal became pregnant before redemption, it belongs to the priest; cf. Num. XVIII, 15-28.');"><sup>7</sup></span>
Sifrei Devarim
(Devarim 18:3) "And this shall be the judgment of the Cohanim": We are hereby taught that the priestly gifts (shoulder, cheeks, and maw) are "law" (to the end of extracting them by court order from a thief who stole them from a Cohein who had acquired them from hefker [ownerless property]).
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