Keeping Vows
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Numbers 30:2
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.
Deuteronomy 23:21
If you make a vow to the LORD your God, do not be slow to keep it, because He will surely require it of you, and you will be guilty of sin.
Deuteronomy 23:23
Be careful to follow through on what comes from your lips, because you have freely vowed to the LORD your God with your own mouth.
Ecclesiastes 5:4–6
When you make a vow to God, do not delay in fulfilling it, because He takes no pleasure in fools. Fulfill your vow. / It is better not to vow than to make a vow and not fulfill it. / Do not let your mouth cause your flesh to sin, and do not tell the messenger that your vow was a mistake. Why should God be angry with your words and destroy the work of your hands?
Matthew 5:33
Again, you have heard that it was said to the ancients, ‘Do not break your oath, but fulfill your vows to the Lord.’