Reference for Niddah 22:33

א"ר יהודה אמר שמואל

refers to one who had marital intercourse, where it might well be assumed that the membrum was the cause of the change;<span class="x" onmousemove="('comment',' Lit., 'the attendant (euphemism) disturbed them', so that the test after the intercourse would prove nothing: and since no test is to be made after intercourse none is required before it (v. Rashi). ');">²⁸</span>

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