Much of what we read here can also be found in Deuteronomy 23:22–23, “But if you refrain from vowing, you will not be guilty of sin. You shall be careful to do what has passed your lips, for you have voluntarily vowed to the Lord your God what you have promised with your mouth. If you go into your neighbour's vineyard, you may eat your fill of grapes, as many as you wish, but you shall not put any in your bag.”
You can make a special promise to God. That’s what we call a vow.
When you do so you should know what you are doing, for it means that you have bound yourself to it.
4 When you vow a vow to God, do not delay paying it, for he has no pleasure in fools. Pay what you vow.