Deuteronomy 23:21-23

When thou shalt vow
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a vow
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unto the LORD
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thy God
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thou shalt not slack
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to pay
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it: for the LORD
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thy God
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will surely
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require
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it of thee; and it would be sin
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in thee.

But if thou shalt forbear
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to vow
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it shall be no sin
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in thee.

That which is gone out
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of thy lips
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thou shalt keep
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and perform
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[even] a freewill offering
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according as thou hast vowed
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unto the LORD
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thy God
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which thou hast promised
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with thy mouth
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