Deuteronomy 23:21-23

New Life Version

²¹ “When you make a promise to the Lord your God, do not be slow to pay it. It would be sin in you, for the Lord your God will be sure to ask you for it. ²² But if you do not make a promise, it would not be sin in you. ²³ Be careful to do what you say you are going to do. Keep the promise you have made to the Lord your God because you want to.