Deuteronomy 23:21-23

JPS_ASV_Byz(i) 21 (23:22) When thou shalt vow a vow unto the LORD thy God, thou shalt not be slack to pay it; for the LORD thy God will surely require it of thee; and it will be sin in thee. 22 (23:23) But if thou shalt forbear to vow, it shall be no sin in thee. 23 (23:24) That which is gone out of thy lips thou shalt observe and do; according as thou hast vowed freely unto the LORD thy God, even that which thou hast promised with thy mouth.