Reference for Niddah 42:40

בבשרה אמר רחמנא ולא בשפופרת

that the woman is unclean; otherwise she is clean. R. Eliezer ruled: 'In her flesh'<span class="x" onmousemove="('comment',' Lev. XV, 19, dealing with the menstruant. ');">²³</span>

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