Ecclesiastes 5:4-7

When you make a vow to God, do not delay in fulfilling it. He has no pleasure in fools; fulfill your vow.  It is better not to vow than to make a vow and not fulfill it.  Do not let your mouth lead you into sin. And do not protest to the temple messenger, “My vow was a mistake.” Why should God be angry at what you say and destroy the work of your hands?  Much dreaming and many words are meaningless. Therefore stand in awe of God.