כַּאֲשֶׁר֩ תִּדֹּ֨ר נֶ֜דֶר לֵֽאלֹהִ֗ים אַל־תְּאַחֵר֙ לְשַׁלְּמ֔וֹ כִּ֛י אֵ֥ין חֵ֖פֶץ בַּכְּסִילִ֑ים אֵ֥ת אֲשֶׁר־תִּדֹּ֖ר שַׁלֵּֽם׃
When thou vowest a vow unto God, defer not to pay it; for He hath no pleasure in fools; pay that which thou vowest.
Read kabbalistic (mystical) interpretation of Ecclesiastes 5:3: and classical mystical sources.