Not to delay his vows for more than three festivals: That we not delay the vows and pledges and other sacrifices that are an obligation upon us. And about this is it stated (Deuteronomy 23:22), “When you make a vow to the Lord, your God, do not delay fulfilling it.” And the tradition came (Rosh Hashanah 4b) [to explain] that we only transgress this negative commandment when three pilgrim holidays have passed after he made the vow. I have written clearly about the whole matter of this commandment in its positive commandment in this Order (Sefer HaChinukh 575) — and take it from there.
שֶׁלֹּא לְאַחֵר נְדָרָיו יוֹתֵר מִשְּׁלֹשָׁה רְגָלִים – שֶׁלֹּא נְאַחֵר הַנְּדָרִים וְהַנְּדָבוֹת וּשְׁאָר הַקָּרְבָּנוֹת שֶׁהֵם חוֹבָה עָלֵינוּ, וְעַל זֶה נֶאֱמַר (דברים כג כב) כִּי תִדֹּר נֶדֶר לַיְיָ אֱלֹהֶיךָ לֹא תְאַחֵר לְשַׁלְּמוֹ. וּבָאָה הַקַּבָּלָה (ר"ה ד, ב), שֶׁאֵין עוֹבְרִין עַל זֶה הַלָּאו עַד שֶׁיַּעַבְרוּ שְׁלֹשָׁה רְגָלִים אַחַר שֶׁנָּדַר. כָּל עִנְיַן מִצְוָה זוֹ כְּתַבְתִּיו מְבֹאָר בְּמִצְוַת עֲשֵׂה שֶׁלּוֹ (מצוה תקעה) שֶׁבְּסֵדֶר זֶה, וְקָחֶנּוּ מִשָּׁם.
Not to delay his vows for more than three festivals: That we not delay the vows and pledges and other sacrifices that are an obligation upon us. And about this is it stated (Deuteronomy 23:22), “When you make a vow to the Lord, your God, do not delay fulfilling it.” And the tradition came (Rosh Hashanah 4b) [to explain] that we only transgress this negative commandment when three pilgrim holidays have passed after he made the vow. I have written clearly about the whole matter of this commandment in its positive commandment in this Order (Sefer HaChinukh 575) — and take it from there.