Jerusalem Talmud Nedarim 8.8

משנה: הָיוּ מְסָרְבִין בּוֹ לָשֵׂאת אֶת בַּת אֲחוֹתוֹ וְאָמַר קוֹנָם שֶׁהִיא נֶהֱנֵית לִי לְעוֹלָם וְכֵן הַמְגָרֵשׁ אֶת אִשְׁתּוֹ וְאָמַר קוֹנָם אִשְׁתִּי נֶהֱנֵית לִי לְעוֹלָם הֲרֵי אֵילּוּ מוּתָּרוֹת לֵיהָנוֹת לוֹ שֶׁלֹּא נִתְכַּוֵון זֶה אֶלָּא לְשֵׁם אִישּׁוּת.

MISHNAH: If they were importuning him to marry his sister’s daughter and he said, a qônām if she ever has any usufruct from me, and similarly, a man who was about to divorce his wife and said, a qônām if my wife ever has any usufruct from me, they may have usufruct from him since he intended only about matters of marriage.

הלכה: הָיוּ מְסָרְבִין בּוֹ לָשֵׂאת אֶת בַּת אֲחוֹתוֹ כול׳. אָמַר רִבִּי יוֹסֵי. רִבִּי יוֹדָה הִיא. דְּרִבִּי יוּדָה אָמַר. הַכֹּל לְפִי הַנֵּדֶר. וְכֵן הַמְגָרֵשׁ אֶת אִשְׁתּוֹ כול׳. אָמַר רִבִּי יוֹסֵי. רִבִּי יוֹדָה הִיא. דְּרִבִּי יוּדָה אָמַר. הַכֹּל לְפִי הַנֵּדֶר.

HALAKHAH: “If they were importuning him to marry his sister’s daughter,” etc. Rebbi Yose said, this is Rebbi Jehudah’s, since Rebbi Jehudah said, “everything refers to the vow.” “And similarly, a man who was about to divorce his wife.” Rebbi Yose said, this is Rebbi Jehudah’s, since Rebbi Jehudah said, “everything refers to the vow.”