New Living Translation
But once you have voluntarily made a vow, be careful to fulfill your promise to the LORD your God.

American Standard Version
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.

Berean Study Bible
Be careful to follow through on what comes from your lips, because you have freely vowed to the LORD your God with your own mouth.

Douay-Rheims Bible
But that which is once gone out of thy lips, thou shalt observe, and shalt do as thou hast promised to the Lord thy God, and hast spoken with thy own will and with thy own mouth.

English Revised Version
That which is gone out of thy lips thou shalt observe and do; according as thou hast vowed unto the LORD thy God, a freewill offering, which thou hast promised with thy mouth.

King James Bible
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.

World English Bible
That which is gone out of your lips you shall observe and do; according as you have vowed to Yahweh your God, a freewill offering, which you have promised with your mouth.

Young's Literal Translation
The produce of thy lips thou dost keep, and hast done it, as thou hast vowed to Jehovah thy God; a free-will-offering, which thou hast spoken with thy mouth.

Deuteronomy 23:23 Additional Translations ...