Reference for Niddah 43:3

רבא אמר

holds that it is usual for a woman to observe blood in a shapeless object<span class="x" onmousemove="('comment',' The woman is, therefore, unclean. Only when the abortion is smooth, and the blood contained within it does not come in contact with the woman's body, the text, 'In her flesh' cannot, be applied to it. ');">³</span>

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