ט֖וֹב אֲשֶׁ֣ר לֹֽא־תִדֹּ֑ר מִשֶׁתִּדּ֖וֹר וְלֹ֥א תְשַׁלֵּֽם׃
Better is it that thou shouldest not vow, than that thou shouldest vow and not pay.
Read halakhic rulings (Jewish law) on Ecclesiastes 5:4 from the Mishneh Torah and classical halakhic sources, free online.