Study Niddah folio 2A with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
Mishnah: Shammai says: For all women who do not have a fixed menstrual cycle, their time is sufficient. Women who discern that menstrual blood emerged do not need to be concerned that perhaps the flow of blood began before they noticed it. Rather, they assume their ritual impurity status begins a
And the Rabbis say: The halakha is neither in accordance with the statement of this tanna nor in accordance with the statement of that tanna; rather, the principle is: A twenty-four-hour period reduces the time from examination to examination. In other words, if her final self-examination took pl
For any woman who has a fixed menstrual cycle [veset], and she examined herself at that time and discovered blood, her time is sufficient, and it is only from that time that she transmits ritual impurity. And with regard to a woman who has sex while using examination cloths [be’edim] before and af
Her time is sufficient, how so? If the woman was sitting in the bed and engaged in handling ritually pure items, and she left the bed and saw blood, she is ritually impure and those items are ritually pure.
Although the Rabbis said that a woman without a fixed menstrual cycle transmits ritual impurity retroactively for a twenty-four-hour period, a woman with a fixed cycle counts her menstrual days only from the moment that she saw blood.