Reference for Niddah 144:9

לא תימא שומרת יום כנגד יום אלא אימא כבועל שומרת יום כנגד יום

while she does convey uncleanness to them?<span class="x" onmousemove="('comment',' To couch and seat that have been occupied by her. ');">⁹</span>

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