Numbers 30:2 in the World English Bible
When a man vows a vow to the LORD, 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.
Context
1 And Moses spake unto the heads of the tribes concerning the children of Israel, saying, This is the thing which the LORD hath commanded.
2 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.
3 If a woman also vow a vow unto the LORD, and bind herself by a bond, being in her father’s house in her youth;