Reference for Niddah 43:28

(ויקרא טו, כה) כי יזוב זוב דמה אמר רחמנא עד דמידב דייב ליה לח אין יבש לא או דלמא

so does semen? — The other replied: As regards counting again, this is the reason why the previous counting is void: because it is impossible for semen to be emitted<span class="x" onmousemove="('comment',' During the days following a period of zibah. ');">²⁷</span>

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