Commentary for Yevamot 129:1

קובעת לה וסת עד שתקבענה שלש פעמים ואין מטהרת מן הוסת עד שתעקר ממנה שלש פעמים ושור המועד דתנן אין השור נעשה מועד עד שיעידו בו שלשה פעמים:

regard her menstrual periods as regular<span class="x" onmousemove="('comment',' To be deemed levitically clean until that period actually arrives. A woman of irregular periods is regarded as unclean for twenty-four hours prior to the monthly date on which her previous discharge occurred (v. Nid. 2a). Should a woman, the regularity of whose periods had been established omit to examine her body when menstruation is due, and subsequently find a discharge, we assume her retrospectively to have become unclean at the beginning of her period, while a woman whose periods are irregular cannot, of course, be subject to such restriction. ');">¹</span> unless the recurrence had been regular three times. Nor is she released from the restrictions of an established regular period unless it has varied three<span class="x" onmousemove="('comment',' If the change of date occurred no more than twice the restrictions remain in force (v. supra n. 8 last clause). ');">²</span> times.<span class="x" onmousemove="('comment',' Nid. 63b. ');">³</span>

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