Ecclesiastes 5
4 Ref When you vow a vow to God, don't defer to pay it; for he has no pleasure in fools. Pay that which you vow.
5 Ref It is better that you should not vow, than that you should vow and not pay.
6 Ref Don't allow your mouth to lead you into sin. Don't protest before the messenger that this was a mistake. Why should God be angry at your voice, and destroy the work of your hands?