Proverbs 26:5-7

Revised Standard Version

⁵ Answer a fool according to his folly,
    lest he be wise in his own eyes.
⁶ He who sends a message by the hand of a fool
    cuts off his own feet and drinks violence.
⁷ Like a lame man’s legs, which hang useless,
    is a proverb in the mouth of fools.