Ecclesiastes 5:4-6

Young's Literal Translation

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.

⁶ Suffer not thy mouth to cause thy flesh to sin, nor say before the messenger, that `it [is] an error,' why is God wroth because of thy voice, and hath destroyed the work of thy hands?