Proverbs 27:22 in the King James Version
Though thou shouldest bray a fool in a mortar among wheat with a pestle, yet will not his foolishness depart from him.
Context
21 The crucible is for silver, and the furnace for gold; but man is refined by his praise.
22 Though you grind a fool in a mortar with a pestle along with grain, yet his foolishness will not be removed from him.
23 Know well the state of your flocks, and pay attention to your herds,