Mishnah Niddah 10:3: If a zav or a zavah [individuals who have certain types of atypical genital discharges which render them impure, and who must count seven clean days before they can be purified] examined themselves on the first day and found they were pure, and on the seventh day and found they were pure, but they did not examine on the rest of the days in the interim, Rabbi Eliezer says: they are thereby presumed to be pure. Rabbi Yehoshua says: they only have the first day and the seventh day alone [in their counting; i.e. they must still count another five clean days]. Rabbi Akiva says: they only have the seventh day alone [i.e. they must count another six clean days].

הַזָּב וְהַזָּבָה שֶׁבָּדְקוּ עַצְמָן בְּיוֹם רִאשׁוֹן וּמָצְאוּ טָהוֹר, וּבַיּוֹם הַשְּׁבִיעִי וּמָצְאוּ טָהוֹר, וּשְׁאָר יָמִים שֶׁבֵּינְתַיִם לֹא בָדְקוּ, רַבִּי אֱלִיעֶזֶר אוֹמֵר, הֲרֵי הֵן בְּחֶזְקַת טָהֳרָה. רַבִּי יְהוֹשֻׁעַ אוֹמֵר, אֵין לָהֶם אֶלָּא יוֹם רִאשׁוֹן וְיוֹם שְׁבִיעִי בִלְבָד. רַבִּי עֲקִיבָא אוֹמֵר, אֵין לָהֶם אֶלָּא יוֹם שְׁבִיעִי בִלְבָד:

Mishnah Niddah 10:4: If a zav or a zavah or a niddah or a woman who recently gave birth or a leper died, they render impurity through carrying until the flesh decays. A gentile who died is pure with regard to rendering impurity through carrying. Beit Shammai say: All women who die are [treated as though they were] niddot. And Beit Hillel say: she [i.e. a dead woman] is only [treated as] a niddah if she died while she was a niddah.

הַזָּב וְהַזָּבָה וְהַנִּדָּה וְהַיּוֹלֶדֶת וְהַמְצֹרָע שֶׁמֵּתוּ, מְטַמְּאִין בְּמַשָּׂא עַד שֶׁיִּמֹּק הַבָּשָׂר. נָכְרִי שֶׁמֵּת, טָהוֹר מִלְּטַמֵּא בְמַשָּׂא. בֵּית שַׁמַּאי אוֹמְרִים, כָּל הַנָּשִׁים מֵתוֹת נִדּוֹת. וּבֵית הִלֵּל אוֹמְרִים, אֵין נִדָּה אֶלָּא שֶׁמֵּתָה נִדָּה: