Proverbs 26:5 KJV

Answer a fool according to his folly, lest he be wise in his own conceit.
Proverbs 26:5, King James Version

In context

4 Answer not a fool according to his folly, lest thou also be like unto him.

5 Answer a fool according to his folly, lest he be wise in his own conceit.

6 He that sendeth a message by the hand of a fool cutteth off the feet, and drinketh damage.