The Mishnah
שבועות א׳Shevuot 1
Perek 1 of 8 in Shevuot — 7 mishnayot
Mishnah 1א׳
שְׁבוּעוֹת שְׁתַּיִם שֶׁהֵן אַרְבַּע, יְדִיעוֹת הַטֻּמְאָה שְׁתַּיִם שֶׁהֵן אַרְבַּע, יְצִיאוֹת הַשַּׁבָּת שְׁתַּיִם שֶׁהֵן אַרְבַּע, מַרְאוֹת נְגָעִים שְׁנַיִם שֶׁהֵם אַרְבָּעָה:
[With regards to] oaths, there are two [types], which are [really] four; the [states of] awareness of impurity are of two [types], which are [really] four; the carrying [from one domain to the other] on Shabbat are of two [types], which are [really] four; the appearances of afflictions of the skin are of two [types], which are [really] four.
Mishnah 2ב׳
כֹּל שֶׁיֵּשׁ בָּהּ יְדִיעָה בַתְּחִלָּה וִידִיעָה בַסּוֹף וְהֶעְלֵם בֵּינְתַּיִם, הֲרֵי זֶה בְּעוֹלֶה וְיוֹרֵד. יֶשׁ בָּהּ יְדִיעָה בַתְּחִלָּה וְאֵין בָּהּ יְדִיעָה בַסּוֹף, שָׂעִיר שֶׁנַּעֲשֶׂה בִפְנִים וְיוֹם הַכִּפּוּרִים תּוֹלֶה, עַד שֶׁיִּוָּדַע לוֹ וְיָבִיא בְעוֹלֶה וְיוֹרֵד:
Any case where there is awareness at the beginning, and awareness at the end, and a period of unawareness in between, it is [atoned] by an Oleh veYored [a sliding-scale sin-offering where the economic status of the individual determines whether he brings an animal, a bird, or flour]. If there was awareness at the beginning, and not at the end, the goat which is performed inside [the Sanctuary] and the Day of Atonement defer [it]; until it becomes known to him [that he sinned], and he then must bring an Oleh veYored [a sliding-scale sin-offering where the economic status of the individual determines whether he brings an animal, a bird, or flour].
Mishnah, Torat Emet 357 edition, via Sefaria — public domain
English: Open Mishnah, Wikisource, via Sefaria — CC BY-SA