Audio by Shloimy Zelcer

Mishnah Niddah 4:7: Throughout all the eleven days [between each period of niddah] she is presumed to be pure. If [during her days of niddah] she sat and did not examine herself, [whether] unintentionally, under duress, or if she intentionally did not examine herself, she is pure. If the time of her regular period arrived and she did not examine herself, she is thereby impure. Rabbi Meir says: if she was in a hiding place when the time of her regular period arrived and she did not examine herself, she is thereby pure, because fear banishes blood. But [a woman] during the days of zivah [i.e. the period of eleven days between niddah periods], or a zavah [who is supposed to be counting seven days of purity], or one who should be waiting a day [of purity] opposite each day [of impurity], they are thereby presumed to be impure [if they did not examine themselves].

כָּל אַחַד עָשָׂר יוֹם בְּחֶזְקַת טָהֳרָה. יָשְׁבָה לָהּ וְלֹא בָדְקָה, שָׁגְגָה, נֶאֶנְסָה, הֵזִידָה וְלֹא בָדְקָה, טְהוֹרָה. הִגִּיעַ שְׁעַת וִסְתָּהּ וְלֹא בָדְקָה, הֲרֵי זוֹ טְמֵאָה. רַבִּי מֵאִיר אוֹמֵר, אִם הָיְתָה בְמַחֲבֵא וְהִגִּיעַ שְׁעַת וִסְתָּהּ, וְלֹא בָדְקָה, הֲרֵי זוֹ טְהוֹרָה, מִפְּנֵי שֶׁחֲרָדָה מְסַלֶּקֶת אֶת הַדָּמִים. אֲבָל יְמֵי הַזָּב וְהַזָּבָה וְשׁוֹמֶרֶת יוֹם כְּנֶגֶד יוֹם, הֲרֵי אֵלּוּ בְּחֶזְקַת טֻמְאָה:

Mishnah Niddah 5:1: For a Caesarean section, one does not sit for the days of impurity or the days of purity, and one is not liable to bring a sacrifice on its account. Rabbi Shimon says: it is like one who was birthed [regularly]. All women render impurity [from when the blood is] in the outer chamber, as the verse says (Leviticus 15), "Blood will be her flow within her flesh." But a zav [a male who has certain types of atypical genital discharges, which render him impure] and a ba'al keri [a male who has had a seminal emission but has yet to purify himself by immersion in a mikveh] do not render impurity until their impurity emerges to the outside.

יוֹצֵא דֹפֶן, אֵין יוֹשְׁבִין עָלָיו יְמֵי טֻמְאָה וִימֵי טָהֳרָה, וְאֵין חַיָּבִין עָלָיו קָרְבָּן. רַבִּי שִׁמְעוֹן אוֹמֵר, הֲרֵי זֶה כְיָלוּד. כָּל הַנָּשִׁים מִטַּמְּאוֹת בַּבַּיִת הַחִיצוֹן, שֶׁנֶּאֱמַר (ויקרא טו), דָּם יִהְיֶה זֹבָהּ בִּבְשָׂרָהּ. אֲבָל הַזָּב וּבַעַל קֶרִי, אֵינָן מִטַּמְּאִים, עַד שֶׁתֵּצֵא טֻמְאָתָן לַחוּץ:

Click here for an introduction to Mishnayos Niddah from "Companion Mishnayot" by Heshey Zelcer

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