Reference for Niddah 145:40

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however, I would only know the case of a man who experienced a discharge on three days, whence the deduction that the restrictions apply to a discharge on two days? It was explicitly stated, 'Days'. But whence the deduction that the same applies to a discharge on one day? It was stated, 'All the days' — And whence do we infer that the woman must count one day to correspond to one day?<span class="x" onmousemove="('comment',' Sc. if she experienced a discharge on one day she must allow one clean day to pass before she may be regarded as clean. ');">³²</span>

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