Reference for Niddah 119:56

הא והא רבי הא בראשון שלה הא בשני שלה

that the other woman's stain may be attributed to her, but here, where the stain may have originated from an external cause,<span class="x" onmousemove="('comment',' Lit., 'where it came from the world'; a case of doubtful uncleanness. ');">⁴⁸</span>

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