Mesorat%20hashas for Niddah 17:16
מאי כיון דוסתות דאורייתא בעיא בדיקה או דלמא
A certain old man asked R. Johanan: 'What is the ruling if, when the time of her fixed period had come during the days of her pregnancy and she did not examine herself? I am raising this question on the view of the authority who laid down [that a woman's duty to hold an examination on the arrival of her] fixed periods is an ordinance of the Torah.<span class="x" onmousemove="('comment',' Sc. a traditional halachah handed down from the time of Moses (Rashi), so that since the flow may be expected to make its appearance on the regular day, a woman who did not examine herself at such a period, must be regarded as unclean (v. infra 16a). ');"><sup>16</sup></span>
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