Reference for Bekhorot 43:10

השליא בבית הבית טמא

But R'Simeon says: The embryo was mashed before it came forth.<span class="x" onmousemove="('comment',' V. Nid. 18a. And it was explained there that the reason why the house is not unclean was because we apply to it the principle of the greater proportion of blood etc., neutralizing the embryo before it came forth.');">⁴</span>

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