Proverbs 26:4

4 Do not answer a fool according to his folly, or you yourself will be just like him.

Read Proverbs 26:4 Using Other Translations

Answer not a fool according to his folly, lest thou also be like unto him.
Answer not a fool according to his folly, lest you be like him yourself.
Don’t answer the foolish arguments of fools, or you will become as foolish as they are.