Reference for Niddah 59:6

י' שבועין למה לי

in which the woman was required to perform [nightly] immersions<span class="x" onmousemove="('comment',' On account of the same possibility that each was the eightieth day (in addition to her daily immersions necessitated by the possibility of her bearing in the condition of zibah). ');">⁶</span>

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