Ecclesiastes 5:4-6

When you make a promise to God, don’t delay in following through, for God takes no pleasure in fools. Keep all the promises you make to him. It is better to say nothing than to make a promise and not keep it. Don’t let your mouth make you sin. And don’t defend yourself by telling the Temple messenger that the promise you made was a mistake. That would make God angry, and he might wipe out everything you have achieved.