Commentary for Niddah 59:23

ר"ע היא דאמר

— Since he had to mention half a week he mentioned all of it, and since he had to mention an unclean week<span class="x" onmousemove="('comment',' The ninth; the first of each pair of alternate weeks, commencing with the first, being assumed (cf. supra 29b ab init.) to be an unclean one. ');">²²</span>

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