Deuteronomy 23:23

You shall be careful to perform what goes out from your lips, just as you have voluntarily vowed to the Lord your God, what you have promised.

Numbers 30:2

If 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.

Judges 11:30-31

Jephthah made a vow to the Lord and said, “If You will indeed give the sons of Ammon into my hand,

Judges 11:35

When he saw her, he tore his clothes and said, “Alas, my daughter! You have brought me very low, and you are among those who trouble me; for I have given my word to the Lord, and I cannot take it back.”

1 Samuel 1:11

She made a vow and said, “O Lord of hosts, if You will indeed look on the affliction of Your maidservant and remember me, and not forget Your maidservant, but will give Your maidservant a son, then I will give him to the Lord all the days of his life, and a razor shall never come on his head.”

1 Samuel 14:24

Now the men of Israel were hard-pressed on that day, for Saul had put the people under oath, saying, “Cursed be the man who eats food before evening, and until I have avenged myself on my enemies.” So none of the people tasted food.

Psalm 66:13-14

I shall come into Your house with burnt offerings;
I shall pay You my vows,

Psalm 116:18

I shall pay my vows to the Lord,
Oh may it be in the presence of all His people,

Proverbs 20:25

It is a trap for a man to say rashly, “It is holy!”
And after the vows to make inquiry.

Ecclesiastes 5:4-5

When you make a vow to God, do not be late in paying it; for He takes no delight in fools. Pay what you vow!

Jeremiah 44:25-27

thus says the Lord of hosts, the God of Israel, as follows: ‘As for you and your wives, you have spoken with your mouths and fulfilled it with your hands, saying, “We will certainly perform our vows that we have vowed, to burn sacrifices to the queen of heaven and pour out drink offerings to her.” Go ahead and confirm your vows, and certainly perform your vows!’

Mark 6:22-23

and when the daughter of Herodias herself came in and danced, she pleased Herod and his dinner guests; and the king said to the girl, “Ask me for whatever you want and I will give it to you.”

Acts 23:12

When it was day, the Jews formed a conspiracy and bound themselves under an oath, saying that they would neither eat nor drink until they had killed Paul.

Acts 23:21

So do not listen to them, for more than forty of them are lying in wait for him who have bound themselves under a curse not to eat or drink until they slay him; and now they are ready and waiting for the promise from you.”

Treasury of Scripture Knowledge

Summary

That which is gone out of thy lips thou shalt keep and perform; even a freewill offering, according as thou hast vowed unto the LORD thy God, which thou hast promised with thy mouth.

Bible References

That which

Numbers 30:2
If 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.
Judges 11:30
Jephthah made a vow to the Lord and said, “If You will indeed give the sons of Ammon into my hand,
1 Samuel 1:11
She made a vow and said, “O Lord of hosts, if You will indeed look on the affliction of Your maidservant and remember me, and not forget Your maidservant, but will give Your maidservant a son, then I will give him to the Lord all the days of his life, and a razor shall never come on his head.”
Psalm 66:13
I shall come into Your house with burnt offerings;
I shall pay You my vows,
Psalm 116:18
I shall pay my vows to the Lord,
Oh may it be in the presence of all His people,
Proverbs 20:25
It is a trap for a man to say rashly, “It is holy!”
And after the vows to make inquiry.
Ecclesiastes 5:4
When you make a vow to God, do not be late in paying it; for He takes no delight in fools. Pay what you vow!

Hast vowed

1 Samuel 14:24
Now the men of Israel were hard-pressed on that day, for Saul had put the people under oath, saying, “Cursed be the man who eats food before evening, and until I have avenged myself on my enemies.” So none of the people tasted food.
Jeremiah 44:25
thus says the Lord of hosts, the God of Israel, as follows: ‘As for you and your wives, you have spoken with your mouths and fulfilled it with your hands, saying, “We will certainly perform our vows that we have vowed, to burn sacrifices to the queen of heaven and pour out drink offerings to her.” Go ahead and confirm your vows, and certainly perform your vows!’
Mark 6:22
and when the daughter of Herodias herself came in and danced, she pleased Herod and his dinner guests; and the king said to the girl, “Ask me for whatever you want and I will give it to you.”
Acts 23:12
When it was day, the Jews formed a conspiracy and bound themselves under an oath, saying that they would neither eat nor drink until they had killed Paul.