Mishnayos Sotah Perek 4 Mishnah 1

With regard to a betrothed woman who secluded herself with another man after being warned by her betrothed, and a widow waiting for her brother-in-law [yavam] to perform levirate marriage who secluded herself with another man after being warned by her yavam, they neither drink the bitter water nor collect payment of their marriage contracts. The reason they are not entitled to payment of their marriage contracts is that the betrothed woman became forbidden to her betrothed or the widow became forbidden to her yavam due to her own actions of entering into seclusion with the paramour. And the fact that they do not drink the bitter water is as it is stated: “This is the law of jealousy, when a wife, while under her husband, goes astray, and is defiled” (Numbers 5:29). The verse excludes a betrothed woman and a widow awaiting her yavam; since they are not yet married, neither is considered as “under her husband.” The mishna delineates cases where the woman’s marriage was prohibited in the first place: With regard to a widow who was married to a High Priest, or a divorcée or ḥalutza who was married to a common priest, or a mamzeret or Gibeonite woman who was married to a Jew of unflawed lineage, or a Jewish woman of unflawed lineage who was married to a mamzer or a Gibeonite, all of these women neither drink the bitter water nor collect payment of their marriage contracts, as the sota ritual applies only to permitted marriages.

אֲרוּסָה וְשׁוֹמֶרֶת יָבָם, לֹא שׁוֹתוֹת וְלֹא נוֹטְלוֹת כְּתֻבָּה, שֶׁנֶּאֱמַר (במדבר ה), אֲשֶׁר תִּשְׂטֶה אִשָּׁה תַּחַת אִישָׁהּ, פְּרָט לַאֲרוּסָה וְשׁוֹמֶרֶת יָבָם. אַלְמָנָה לְכֹהֵן גָּדוֹל, גְּרוּשָׁה וַחֲלוּצָה לְכֹהֵן הֶדְיוֹט, מַמְזֶרֶת וּנְתִינָה לְיִשְׂרָאֵל, וּבַת יִשְׂרָאֵל לְמַמְזֵר וּלְנָתִין, לֹא שׁוֹתוֹת וְלֹא נוֹטְלוֹת כְּתֻבָּה: