Deuteronomy:23:21-23
jps@Deuteronomy:23:21 @ 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.
jps@Deuteronomy:23:22 @ But if thou shalt forbear to vow, it shall be no sin in thee.
jps@Deuteronomy:23:23 @ 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.