Mesorat%20hashas for Ketubot 152:5
מיתיבי מחט שנמצאת בעובי בית הכוסות מצד אחד כשרה משני צדדין טריפה נמצא עליה קורט דם בידוע שהוא לפני שחיטה לא נמצא עליה קורט דם בידוע שהוא לאחר שחיטה
An objection was raised: If a needle was found in the thick walls of the second stomach [of a beast that had been properly slaughtered and it protrudes only] from one of its sides, the beast is kosher; [but if it protruded] from both sides, the beast is terefah. If a drop of blood was found on [the needle] it is certain that [the wound was inflicted] before the ritual killing; if no drop of blood was found on it, it is certain that [the wound was made] after the killing.
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