רַבִּי יִצְחָק אוֹמֵר: יֵשׁ לָהֶם עַל מָה שֶׁיִּסָּמֵכוּ, שֶׁנֶּאֱמַר: ״כֹּל נְדִיב לִבּוֹ״. חֲנַנְיָה בֶּן אֲחִי רַבִּי יְהוֹשֻׁעַ אוֹמֵר: יֵשׁ לָהֶם עַל מָה שֶׁיִּסָּמֵכוּ, שֶׁנֶּאֱמַר: ״נִשְׁבַּעְתִּי וָאֲקַיֵּימָה לִשְׁמוֹר מִשְׁפְּטֵי צִדְקֶךָ״.
Rabbi Yitzḥak says: These halakhot have something to support them, as it is stated: “Whoever is of a willing heart, let him bring it” (Exodus 35:5). This verse indicates that as long as one retains the same desire to fulfill the vow, he must continue to fulfill it, but if he regrets taking the vow he may arrange for it to be dissolved. Ḥananya, son of Rabbi Yehoshua’s brother, also says: They have something to support them, as it is stated: “I have sworn, and have fulfilled it, to observe your righteous ordinances” (Psalms 119:106). This verse indicates that certain oaths need not be fulfilled, i.e., those that have been dissolved.