Numbers 30:2

2When a man makes a vow to the Lord or takes an oath to obligate himself by a pledge, he must not break his word but must do everything he said.

2If a man makes a vow to the Lord, or takes an oath to 30:2 Lit bind on his soul, and similarly throughout the chput himself under a binding obligation, he shall not break his word; he shall act in accordance with everything that comes out of his mouth.

2If a man makes a vow to the Lord, or takes an oath to bind himself with a binding obligation, he shall not violate his word; he shall do according to all that proceeds out of his mouth.

2If a man makes a vow to the Lord or swears an oath to bind himself with a pledge [of abstinence], he shall not break (violate, profane) his word; he shall do according to all that proceeds out of his mouth.

2If 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.30:2 Cited in Matthew 5:33

2Suppose a man makes a special promise to the Lord. Or suppose he gives his word to do something. Then he must keep his promise. He must do everything he said he would do.