Reference for Chullin 70:35

מאי לאו הא דם שחיטה מכשיר

and it would have been self-evident with regard to the blood of a dead animal! - It was necessary for him to state his view with regard to the blood of a dead animal,<span class="x" onmousemove="('comment',' That it cannot render foodstuffs susceptible to uncleanness.');">¹³</span>

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