Matthew 5:33-37
Again, you have heard that it was said to the ancients, ‘Do not break your oath, but fulfill your vows to the Lord.’ / But I tell you not to swear at all: either by heaven, for it is God’s throne; / or by the earth, for it is His footstool; or by Jerusalem, for it is the city of the great King. ...

James 5:12
Above all, my brothers, do not swear, not by heaven or earth or by any other oath. Simply let your “Yes” be yes, and your “No,” no, so that you will not fall under judgment.

Deuteronomy 23:21-23
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. / But if you refrain from making a vow, you will not be guilty of sin. / 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?

Leviticus 5:4-5
Or if someone swears thoughtlessly with his lips to do anything good or evil—in whatever matter a man may rashly pronounce an oath—even if he is unaware of it, when he realizes it, he is guilty in the matter. / If someone incurs guilt in one of these ways, he must confess the sin he has committed,

Matthew 23:16-22
Woe to you, blind guides! You say, ‘If anyone swears by the temple, it means nothing; but if anyone swears by the gold of the temple, he is bound by his oath.’ / You blind fools! Which is greater: the gold, or the temple that makes it sacred? / And you say, ‘If anyone swears by the altar, it means nothing; but if anyone swears by the gift on it, he is bound by his oath.’ ...

Judges 11:30-31
Jephthah made this vow to the LORD: “If indeed You will deliver the Ammonites into my hand, / then whatever comes out the door of my house to greet me on my triumphant return from the Ammonites will belong to the LORD, and I will offer it up as a burnt offering.”

Psalm 15:4
who despises the vile but honors those who fear the LORD, who does not revise a costly oath,

Proverbs 20:25
It is a trap for a man to dedicate something rashly, only later to reconsider his vows.

1 Samuel 1:11
And she made a vow, saying, “O LORD of Hosts, if only You will look upon the affliction of Your maidservant and remember me, not forgetting Your maidservant but giving her a son, then I will dedicate him to the LORD all the days of his life, and no razor shall ever touch his head.”

Acts 5:1-4
Now a man named Ananias, together with his wife Sapphira, also sold a piece of property. / With his wife’s full knowledge, he kept back some of the proceeds for himself, but brought a portion and laid it at the apostles’ feet. / Then Peter said, “Ananias, how is it that Satan has filled your heart to lie to the Holy Spirit and withhold some of the proceeds from the land? ...

Genesis 28:20-22
Then Jacob made a vow, saying, “If God will be with me and watch over me on this journey, and if He will provide me with food to eat and clothes to wear, / so that I may return safely to my father’s house, then the LORD will be my God. / And this stone I have set up as a pillar will be God’s house, and of all that You give me I will surely give You a tenth.”

1 Samuel 14:24-28
Now the men of Israel were in distress that day, for Saul had placed the troops under an oath, saying, “Cursed is the man who eats any food before evening, before I have taken vengeance on my enemies.” So none of the troops tasted any food. / Then all the troops entered the forest, and there was honey on the ground. / And when they entered the forest and saw the flowing honey, not one of them put his hand to his mouth, because they feared the oath. ...

2 Corinthians 1:17-20
When I planned this, did I do it carelessly? Or do I make my plans by human standards, so as to say “Yes, yes” and also “No, no”? / But as surely as God is faithful, our message to you is not “Yes” and “No.” / For the Son of God, Jesus Christ, who was proclaimed among you by me and Silvanus and Timothy, was not “Yes” and “No,” but in Him it has always been “Yes.” ...

Jonah 2:9
But I, with the voice of thanksgiving, will sacrifice to You. I will fulfill what I have vowed. Salvation is from the LORD!”