Reference for Niddah 42:17

רבי יהושע אומר

the woman is unclean, otherwise she is clean. This is in agreement with Symmachus,<span class="x" onmousemove="('comment',' Who laid down supra that blood in the interior of the object causes the same uncleanness as external blood that was discharged with it. ');">¹⁴</span>

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