Reference for Niddah 42:31

וכן כי אתא זוגא דמן חדייב אתא ואייתי מתניתא בידיה

as well as without?<span class="x" onmousemove="('comment',' Sc. when it had completely left the body. In the case of zibah and the emission of semen there can be no uncleanness before the discharge had left the body. ');">²⁷</span>

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