^21 (A)“When you make a vow to the Lord your God, do not put off doing what you promised; the Lord will hold you to your vow, and it is a sin not to keep it. ²² It is no sin not to make a vow to the Lord, ²³ but if you make one voluntarily, be sure that you keep it.

Teaching about Vows

^33 (A)“You have also heard that people were told in the past, ‘Do not break your promise, but do what you have vowed to the Lord to do.’