Reference for Niddah 119:20

והיא שרואה

was the latter's second day,<span class="x" onmousemove="('comment',' Sc. the day during a zibah period following the one on which she observed a discharge, though on that day none had been observed. This assumption in favour of the former is permitted (despite the slight disadvantage to the latter of having to wait another day) because of the latter's known condition of uncleanness. ');">¹⁸</span>

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