23 You shall observe and do that which has gone out of your lips. Whatever you have vowed to Yahweh your God as a free will offering, which you have promised with your mouth, you must do.
Deuteronomy 23:23 Cross References - WEB
Numbers 30:2
2 When a man vows a vow to Yahweh, or swears an oath to bind his soul with a bond, he shall not break his word. He shall do according to all that proceeds out of his mouth.
Judges 11:30-31
30 Jephthah vowed a vow to Yahweh, and said, “If you will indeed deliver the children of Ammon into my hand,
31 then it shall be, that whatever comes out of the doors of my house to meet me when I return in peace from the children of Ammon, it shall be Yahweh’s, and I will offer it up for a burnt offering.”
Judges 11:35
35 When he saw her, he tore his clothes, and said, “Alas, my daughter! You have brought me very low, and you are one of those who trouble me; for I have opened my mouth to Yahweh, and I can’t go back.”
1 Samuel 1:11
11 She vowed a vow, and said, “Yahweh of Armies, if you will indeed look at the affliction of your servant and remember me, and not forget your servant, but will give to your servant a boy, then I will give him to Yahweh all the days of his life, and no razor shall come on his head.”
1 Samuel 14:24
24 The men of Israel were distressed that day; for Saul had adjured the people, saying, “Cursed is the man who eats any food until it is evening, and I am avenged of my enemies.” So none of the people tasted food.
Psalms 66:13-14
Psalms 116:18
18 I will pay my vows to Yahweh, yes, in the presence of all his people,
Proverbs 20:25
25 It is a snare to a man to make a rash dedication, then later to consider his vows.
Ecclesiastes 5:4-5
Jeremiah 44:25-27
25 Yahweh of Armies, the God of Israel, says, ‘You and your wives have both spoken with your mouths, and with your hands have fulfilled it, saying, “We will surely perform our vows that we have vowed, to burn incense to the queen of the sky, and to pour out drink offerings to her.” “‘Establish then your vows, and perform your vows.’
26 “Therefore hear Yahweh’s word, all Judah who dwell in the land of Egypt: ‘Behold, I have sworn by my great name,’ says Yahweh, ‘that my name will no more be named in the mouth of any man of Judah in all the land of Egypt, saying, “As the Lord Yahweh lives.”
27 Behold, I watch over them for evil, and not for good; and all the men of Judah who are in the land of Egypt will be consumed by the sword and by the famine, until they are all gone.
Mark 6:22-23
Acts 23:12
12 When it was day, some of the Jews banded together, and bound themselves under a curse, saying that they would neither eat nor drink until they had killed Paul.
Acts 23:21
21 Therefore don’t yield to them, for more than forty men lie in wait for him, who have bound themselves under a curse to neither eat nor drink until they have killed him. Now they are ready, looking for the promise from you.”