New Living Translation
A man who makes a vow to the LORD or makes a pledge under oath must never break it. He must do exactly what he said he would do.

American Standard Version
When a man voweth a vow unto Jehovah, or sweareth an oath to bind his soul with a bond, he shall not break his word; he shall do according to all that proceedeth out of his mouth.

Berean Study Bible
If a man makes a vow to the LORD or swears an oath to obligate himself by a pledge, he must not break his word; he must do everything he has promised.

Douay-Rheims Bible
If any man make a vow to the Lord, or bind himself by an oath: he shall not make his word void but shall fulfil all that he promised.

English Revised Version
When a man voweth a vow unto the LORD, or sweareth an oath to bind his soul with a bond, he shall not break his word; he shall do according to all that proceedeth out of his mouth.

King James Bible
If a man vow a vow unto the LORD, or swear an oath to bind his soul with a bond; he shall not break his word, he shall do according to all that proceedeth out of his mouth.

World English Bible
When a man vows a vow to Yahweh, or swears an oath to bind his soul with a bond, he shall not break his word; he shall do according to all that proceeds out of his mouth.

Young's Literal Translation
'When a man voweth a vow to Jehovah, or hath sworn an oath to bind a bond on his soul, he doth not pollute his word; according to all that is going out from his mouth he doth.

Numbers 30:2 Additional Translations ...