Deuteronomy 23:21-23
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21“When you make a vow to the Lord your God, you shall not delay to pay it, for the Lord your God will certainly require it of you, and it will be a sin for you. 22However, if you refrain from making vows, it will not be a sin for you. 23You shall be careful and perform what goes out of your lips, since in fact you have vowed a voluntary offering to the Lord your God, whatever you have promised.