Ecclesiastes 5:4 - 5:6
4 When you make a vow to God, do not be late in paying it; for He takes no delight in fools. Pay what you vow! 5 It is better that you should not vow than that you should vow and not pay. 6 Do not allow your mouth to cause your flesh to sin, and do not say in the presence of the messenger of God that it was a mistake. Why should God be angry on account of your voice and wreak destruction on the work of your hands?