Reference for Niddah 119:53

רישא אמרת אין תולין סיפא אמרת תולין

you said [that the other woman's stain] may not be attributed [to her], how much less then may this be done in this case 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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