כַּאֲשֶׁר֩ תִּדֹּ֨ר נֶ֜דֶר לֵֽאלֹהִ֗ים אַל־תְּאַחֵר֙ לְשַׁלְּמ֔וֹ כִּ֛י אֵ֥ין חֵ֖פֶץ בַּכְּסִילִ֑ים אֵ֥ת אֲשֶׁר־תִּדֹּ֖ר שַׁלֵּֽם׃
Wenn du Gott ein Gelübde abgibst, zögere nicht, es zu erfüllen, denn er hat keine Lust an solchen Narren; was du gelobest, erfülle!
Midrash Tehillim
I will fulfill my vows to the Lord. Rabbi Yehuda says (Ecclesiastes 5:3): 'It is better not to make a vow than to make one and not fulfill it.' It is better not to vow at all, as it is said (Deuteronomy 23:23): 'When you make a vow to the Lord your God, do not be slow to pay it, for the Lord your God will surely demand it of you, and you will be guilty of sin.' Rabbi Meir says: It is better to vow and fulfill, as it is said (Psalm 76:12): 'Make vows to the Lord your God and fulfill them.'"...