Reference for Niddah 17:27

לפיכך אם היתה מניקתו והולכת ארבע או חמש שנים דיה שעתה דברי ר"מ

[that a woman's duty to examine herself at the time of the arrival of her] fixed periods is an ordinance of the Torah and that, nevertheless, since there was fear, her menstrual blood is deemed to be suspended and she requires no exemption; so also here,<span class="x" onmousemove="('comment',' The case of the pregnant woman referred to in the old man's enquiry. ');">²⁶</span>

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