Leviticus 27:9-10

9“If the vow
Hebrew it
is an animal that may be offered as an offering to the Lord, all of it that he gives to the Lord is holy.
10 bHe shall not exchange it or make a substitute for it, good for bad, or bad for good; and if he does in fact substitute one animal for another, then both it and the substitute shall be holy.

Leviticus 27:31

31If a man wishes to redeem some of his tithe, he shall add a fifth to it.

Numbers 30:2-16

2 cIf a man vows a vow to the Lord, or dswears an oath to bind himself by a pledge, he shall not break his word. eHe shall do according to all that proceeds out of his mouth.

Women and Vows

3If a woman vows a vow to the Lord and binds herself by a pledge, while within her father’s house in her youth, 4and her father hears of her vow and of her pledge by which she has bound herself and says nothing to her, then all her vows shall stand, and every pledge by which she has bound herself shall stand. 5But if her father opposes her on the day that he hears of it, no vow of hers, no pledge by which she has bound herself shall stand. And the Lord will forgive her, because her father opposed her.

6If she marries a husband, while under her fvows or any thoughtless utterance of her lips by which she has bound herself, 7and her husband hears of it and says nothing to her on the day that he hears, then her vows shall stand, and her pledges by which she has bound herself shall stand. 8But if, on the day that her husband comes to hear of it, he opposes her, then he makes void her gvow that was on her, and the thoughtless utterance of her lips by which she bound herself. hAnd the Lord will forgive her. 9(But any vow of a widow or of a divorced woman, anything by which she has bound herself, shall stand against her.) 10And if she vowed in her husband’s house or bound herself by a pledge with an oath, 11and her husband heard of it and said nothing to her and did not oppose her, then all her vows shall stand, and every pledge by which she bound herself shall stand. 12But if her husband makes them null and void on the day that he hears them, then whatever proceeds out of her lips concerning her vows or concerning her pledge of herself shall not stand. Her husband has made them void, and ithe Lord will forgive her. 13Any vow and any binding oath to afflict herself,
Or  to fast
her husband may establish,
Or  may allow to stand
or her husband may make void.
14But if her husband says nothing to her from day to day, then he establishes all her vows or all her pledges that are upon her. He has established them, because he said nothing to her on the day that he heard of them. 15But if he makes them null and void after he has heard of them, then lhe shall bear her iniquity.”

16These are the statutes that the Lord commanded Moses about a man and his wife and about a father and his daughter while she is in her youth within her father’s house.

Ecclesiastes 5:4-6

4When myou vow a vow to God, ndo not delay paying it, for he has no pleasure in fools. oPay what you vow. 5 pIt is better that you should not vow than that you should vow and not pay. 6Let not your mouth lead you
Hebrew your flesh
into sin, and do not say before rthe messenger
Or angel
that it was ta mistake. Why should God be angry at your voice and destroy the work of your hands?

Matthew 5:33

Oaths

33Again uyou have heard that it was said to those of old, v‘You shall not swear falsely, but wshall perform to the Lord what you have sworn.’
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