Reference for Chullin 105:25

דרוסת הנץ בדרבי מיניה ואינך בדכוותייהו

Rabbah son of R'Huna said in the name of Rab: If a lion had entered amidst oxen and later there was found a nail [from a lion's claw] lodged in the back of one of them, there is no fear that the lion had clawed it.

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