Reference for Niddah 43:20

אלא מעתה תסתור כל שבעה

is regarded as having touched the semen.<span class="x" onmousemove="('comment',' Had the uncleanness been conveyed to him on account of his observation of it, no minimum would have been prescribed, as none was prescribed for menstrual blood (a case of uncleanness through observation) and where the smallest drop of blood suffices to cause uncleanness. ');">¹⁹</span>

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