Reference for Niddah 58:21

כשראתה בערב

not be permitted to perform her marital duty in the fourth week though she had observed a discharge of blood seeing that it is clean blood?<span class="x" onmousemove="('comment',' Since the fourth week is inevitably excluded from the unclean periods (seven days for a male and fourteen for a female) that follow childbirth, and included in the thirty-three clean days prescribed for a male birth. ');">¹⁹</span>

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