Reference for Bekhorot 79:14

מעשה שמיעך ולא יצא נשחטה ונמצאת דבוקה בכסלים והתיר ר"ע ואסר רבי יוחנן בן נורי:

IT HAPPENED THAT ONE RUBBED IT AND [THE STONE] DID NOT COME OUT, BUT WHEN IT WAS SLAUGHTERED [THE STONE] WAS FOUND ATTACHED TO THE LOINS, AND R'AKIBA PERMITTED [THE ANIMAL]<span class="x" onmousemove="('comment',' To be eaten, for it was a blemish, owing to the fact that it was not in its place.');">⁶</span>

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