Reference for Niddah 59:26

אבל אמרו חכמים אסור לעשות כן שמא תבא לידי ספק

due to the possibility of the woman's being a zabah?<span class="x" onmousemove="('comment',' During the preceding unclean week. Only in the case of the fourth week which has been preceded by clean weeks could no such immersions be expected. ');">²⁵</span>

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