Reference for Niddah 42:49

רבי אליעזר אומר

the woman is unclean. What is his reason? It may be described as 'In her flesh'.<span class="x" onmousemove="('comment',' It being a Pentateuchal ordinance that when the blood was in direct contact with the woman's body uncleanness is caused. ');">⁴¹</span>

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