Commentary for Niddah 106:21

רב נחמן אמר

as he was sitting at his studies and discoursing as follows: 'She may for twenty-four hours ascribe her stain to her observation. This is the ruling of Rabbi. In connection with this Resh Lakish explained that it applied only where she has examined herself,<span class="x" onmousemove="('comment',' Near the time of discovering the stain, within twenty-four hours; but if twenty-four hours have passed between the examination and the discovery of the stain the woman is deemed unclean retrospectively from the time of the examination (Tosaf.). ');">²⁰</span>

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