Reference for Chullin 105:23

דרוסת הנץ בדכוותיה ואינך בדזוטרא מינייהו

But since you have already said it must not be unintentional, is it then at all necessary to say that must not be by a dead animal? - It is indeed necessary for the case where the animal struck with its claw and it was immediately amputated.

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