Commentary for Niddah 137:45
אמר להו
we have an established rule that during the first week of her appearance before us we require her to undergo immersion in the nights<span class="x" onmousemove="('comment',' Since of each night it might be said that it is the one following the seventh day of the period of uncleanness prescribed after the birth of a male child. ');"><sup>33</sup></span>
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