Deuteronomy 23:23
That which is uttered by thy lips thou shalt keep and perform; even a free-will-offering, according as thou hast vowed to the LORD thy God, which thou hast promised with thy mouth.That which is uttered by thy lips thou shalt keep and perform; even a free-will-offering, according as thou hast vowed to the LORD thy God, which thou hast promised with thy mouth.