ESV: You shall be careful to do what has passed your lips, for you have voluntarily vowed to the Lord your God what you have promised with your mouth.
NIV: Whatever your lips utter you must be sure to do, because you made your vow freely to the Lord your God with your own mouth.
NASB: You shall be careful and perform what goes out of your lips, since in fact you have vowed a voluntary offering to the Lord your God, whatever you have promised.
CSB: Be careful to do whatever comes from your lips, because you have freely vowed what you promised to the Lord your God.
NLT: But once you have voluntarily made a vow, be careful to fulfill your promise to the Lord your God.
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.
NKJV: That which has gone from your lips you shall keep and perform, for you voluntarily vowed to the Lord your God what you have promised with your mouth.