Ecclesiastes 5:4-6

MSB^{(i) 4} When you make a vow to God, do not delay in fulfilling it, because He takes no pleasure in fools. Fulfill your vow. ⁵ It is better not to vow than to make a vow and not fulfill it. ⁶ Do not let your mouth cause your flesh to sin, and do not tell the messenger that your vow was a mistake. Why should God be angry with your words and destroy the work of your hands?