Numbers 30:2 in the King James Version
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.
Context
1 Moses spoke to the heads of the tribes of the children of Israel, saying, “This is the thing which the LORD has commanded.
2 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.
3 “Also, when a woman vows a vow to the LORD and binds herself by a pledge, being in her father’s house, in her youth,