Proverbs 26:2-4

New Revised Standard Version, Anglicised Catholic Edition

² Like a sparrow in its flitting, like a swallow in its flying,
    an undeserved curse goes nowhere.
³ A whip for the horse, a bridle for the donkey,
    and a rod for the back of fools.
⁴ Do not answer fools according to their folly,
    or you will be a fool yourself.