Reference for Keritot 15:19

לילה מחוסר זמן

- This is what we are informed: Only when he perceives [three issues] on the night of the eighth day; but if on the day of the seventh,he is not liable; for he holds that an issue which disturbs [the period of cleanness]<span class="x" onmousemove="('comment',' The issue on the seventh day destroys the period of cleanness of seven days, and they must be started again.');">¹¹</span>

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