Jerusalem Talmud Nedarim 11.11

משנה: קוֹנָם שֶׁאֵינִי נֶהֱנִית לְאַבָּא וּלְאָבִיךָ אִם עוֹשָׂה אֲנִי עַל פִּיךָ. שֶׁאֵינִי נֶהֱנִית לָךְ אִם עוֹשָׂה אֲנִי עַל פִּי אַבָּא וְעַל פִּי אָבִיךָ הֲרֵי זֶה יָפֵר.

MISHNAH: ‘A qônām that I shall not take any benefit from my father, or your father, if I shall do anything for you.’ ‘[A qônām] that I shall not have any benefit from you if I shall do anything for my father, or for your father.’ These he can dissolve.

הלכה: קוֹנָם שֶׁאֵינִי נֶהֱנִית לְאַבָּא וּלְאָבִיךָ כול׳. תַּנֵּי. רִבִּי נָתָן אוֹמֵר. לֹא יָפֵר. וַחֲכָמִים אוֹמְרִים. יָפֵר. מִפְּנֵי מָה הוּא מֵיפֵר. חֲבֵרַיָיא אָמְרֵי. מִפְּנֵי עִינּוּי נֶפֶשׁ שֶׁלּוֹ. רִבִּי זְעִירָא וְרִבִּי הִילָא תְּרֵיהוֹן אָמְרִין מִפְּנֵי נִדְרֵי עִינּוּי נֶפֶשׁ שֶׁלָּהּ.

HALAKHAH: “ ‘A qônām that I shall not take any benefit from my father, or your father,” etc. It was stated: Rebbi Nathan says, he cannot dissolve, but the Sages say, he can dissolve. Why can he dissolve? The colleagues say, because of his mortification. Rebbi Ze‘ira and Rebbi Hila say, because of her mortification.