Deuteronomy 23:22-24

Complete Jewish Bible

^22 (21) “When you make a vow to Adonai your God, you are not to delay in fulfilling it, for Adonai your God will certainly demand it of you, and your failure to do so will be your sin. ^23 (22) If you choose not to make a vow at all, that will not be a sin for you; ^24 (23) but if a vow passes your lips, you must take care to perform it according to what you voluntarily vowed to Adonai your God, what you promised in words spoken aloud.