Proverbs 26:6-8

Complete Jewish Bible

⁶ Telling a message to a fool and sending him out
    is like cutting off one’s feet and drinking violence.
⁷ The legs of the disabled hang limp and useless;
    likewise a proverb in the mouth of a fool.
⁸ Like one who ties his stone to the sling
    is he who gives honor to a fool.