אַרְבָּעָה מִינֵי שְׁבוּעוֹת הֵן. שְׁבוּעַת בִּטּוּי וּשְׁבוּעַת שָׁוְא וּשְׁבוּעַת הַפִּקָּדוֹן וּשְׁבוּעַת הָעֵדוּת. שְׁבוּעַת בִּטּוּי הוּא שֶׁנֶּאֱמַר בַּתּוֹרָה (ויקרא ה ד) "אוֹ נֶפֶשׁ כִּי תִשָּׁבַע לְבַטֵּא בִשְׂפָתַיִם לְהָרַע אוֹ לְהֵיטִיב". וְהִיא נֶחְלֶקֶת לְאַרְבָּעָה חֲלָקִים. שְׁתַּיִם לְהַבָּא. וּשְׁתַּיִם לְשֶׁעָבַר. כְּגוֹן שֶׁנִּשְׁבַּע עַל דָּבָר שֶׁעָבַר שֶׁנַּעֲשָׂה אוֹ שֶׁלֹּא נַעֲשָׂה. וְעַל דָּבָר שֶׁעָתִיד לִהְיוֹת שֶׁיֵּעָשֶׂה וְשֶׁלֹּא יֵעָשֶׂה:
There are four types of oaths [for which one may be liable]: sh'vuat bitui, sh'vuat shav, sh'vuat hapikadon, and sh'vuat ha'edut. Sh'vuat bitui is referred to in the Torah [by Leviticus 5:4]: "When a soul will take an oath, expressing with his lips, whether he will do harm or do good." [This category] subdivides into four groupings: two [involving statements made] concerning the future and two [involving statements made] concerning the past. For example, he took an oath concerning a past event that it occurred or did not occur, or concerning a future event, that he will do it or that he will not do it.
