Ecclesiastes 5:5

Better is it that thou shouldest not vow ,.... For a vow is an arbitrary thing; a man is not bound to make it, and while he vows not, it is in his own power, and at his option, whether he will do this or that, or not; but when he has once vowed, he is then brought under an obligation, and must perform; see Acts 5:4 ; and therefore it is better not to vow; it is more acceptable to God, and, it is better for a man;

than that thou shouldest vow and not pay ; for this shows great weakness and folly, levity and inconstancy, and is resented by the Lord.