Reference for Niddah 40:21

קרי עליה

[An examination, however, for the purpose of distinguishing] between the blood of uncleanness and cleanness<span class="x" onmousemove="('comment',' At the end of the period of cleanness after a childbirth which is the fortieth day for a male and the eightieth for a female (cf. Lev. XII, 1-5). ');">¹⁷</span>

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