American Standard Version (ASV):
That which is gone out of thy lips thou shalt observe and do; according as thou hast vowed unto Jehovah thy God, a freewill-offering, which thou hast promised with thy mouth.
King James Version (KJV):
That which is gone out of thy lips thou shalt keep and perform; [even] a freewill offering, according as thou hast vowed unto the LORD thy God, which thou hast promised with thy mouth.