Proverbs 19:25 in the World English Bible
Flog a scoffer, and the simple will learn prudence; rebuke one who has understanding, and he will gain knowledge.
Context
24 A slothful man hideth his hand in his bosom, and will not so much as bring it to his mouth again.
25 Smite a scorner, and the simple will beware: and reprove one that hath understanding, and he will understand knowledge.
26 He that wasteth his father, and chaseth away his mother, is a son that causeth shame, and bringeth reproach.