Ecclesiastes 5:3-5

Young's Literal Translation

³ For the dream hath come by abundance of business, and the voice of a fool by abundance of words.

⁴ When thou vowest a vow to God, delay not to complete it, for there is no pleasure in fools; that which thou vowest -- complete.

⁵ Better that thou do not vow, than that thou dost vow and dost not complete.