Proverbs 26:2-4

Revised Standard Version

² Like a sparrow in its flitting, like a swallow in its flying,
    a curse that is causeless does not alight.
³ A whip for the horse, a bridle for the ass,
    and a rod for the back of fools.
⁴ Answer not a fool according to his folly,
    lest you be like him yourself.