Ecclesiastes 5:2-5

Do not be hasty with your mouth [speaking careless words or vows] or impulsive in thought to bring up a matter before God. For God is in heaven and you are on earth; therefore let your words be few. For the dream comes through much effort, and the voice of the fool through many words. When you make a vow or a pledge to God, do not put off paying it; for God takes no pleasure in fools [who thoughtlessly mock Him]. Pay what you vow. [Ps 50:14; 66:13, 14; 76:11] It is better that you should not vow than that you should vow and not pay. [Prov 20:25; Acts 5:4]