Reference for Niddah 49:51

אם איתא דולד הואי לא הוה זיג כולי האי

because] in case of doubt in a ritual prohibition a restrictive course must be followed; and so also [on the question of the uncleanness] of a woman [the abortion of a sac is deemed to be a valid birth,<span class="x" onmousemove="('comment',' Which imposes uncleanness upon the woman. ');">⁴⁶</span>

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