Ecclesiastes 5:2-4

²Don't say rash things, and think before you speak to God. For God is in heaven, and you are on earth, so keep it short.

³When you worry too much, you get nightmares; when you talk too much, you say foolish things.

⁴When you make a vow to God, with a curse on you if you don't keep it, don't be slow in keeping it, for he is not happy with foolish behavior. So do what you promised!