Reference for Niddah 23:36

אין לה וסת בעיא בדיקה יש לה וסת לא בעיא בדיקה

only when she is awake<span class="x" onmousemove="('comment',' Because (a) as she is then able to handle clean things and would have to be examined for the purpose she must also be examined for the sake of her husband: and (b) an examination when one is awake does not involve undue inconvenience. ');">³²</span>

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