Deuteronomy 23:21-23

New King James Version

^21 (A)“When you make a vow to the Lord your God, you shall not delay to pay it; for the Lord your God will surely require it of you, and it would be sin to you. ²² But if you abstain from vowing, it shall not be sin to you. ^23 (B)That which has gone from your lips you shall keep and perform, for you voluntarily vowed to the Lord your God what you have promised with your mouth.