Genesis 28:20
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,

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.

1 Samuel 1:11
And she made a vow, pleading, "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 come over his head."

Ecclesiastes 5:1, 2, 4, 5
Guard your steps when you go to the house of God. Draw near to listen rather than to offer the sacrifice of fools, who do not know that they do wrong. . . .