Reference for Niddah 144:6

כשומרת יום כנגד יום

— Do not read, 'A woman who waits a day for a day' but read: Like a man who had intercourse with one who waits a day for a day.<span class="x" onmousemove="('comment',' Because R. Huna agrees in the case of the man that, if the intercourse took place on the second day after the woman's immersion, the question of his uncleanness must he held in suspense and that before a second discharge appears he is even Rabbinically free from certain uncleanness. ');">⁶</span>

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