Proverbs 26:4-6

New International Version

⁴ Do not answer a fool according to his folly,
    or you yourself will be just like him.^(A)
5 Answer a fool according to his folly,
    or he will be wise in his own eyes.^(B)
6 Sending a message by the hands of a fool^(C)
    is like cutting off one’s feet or drinking poison.