Reference for Bekhorot 78:2

הצורם אזן הפר ואח"כ קיבל דמו פסול שנאמר

If one makes a slit in the ear of the bull<span class="x" onmousemove="('comment',' Belonging to the anointed priest, after its slaughter but before the receiving of the blood.');">¹</span>

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