Proverbs 26:4-5

Amplified Bible

⁴ 
Do not answer [nor pretend to agree with the frivolous comments of] a [closed-minded] fool according to his folly,
Otherwise you, even you, will be like him.
⁵ 
Answer [and correct the erroneous concepts of] a fool according to his folly,
Otherwise he will be wise in his own eyes [if he thinks you agree with him].^(A)