Proverbs 27 22
Even if you ground stupid people in a mortar, crushing them like grain with the pestle, you can't get rid of stupidity from them.
Compare with other 3 random translations
CSB Proverbs 27:22Though you grind a fool in a mortar with a pestle along with grain, you will not separate his foolishness from him.
NCV Proverbs 27:22Even if you ground up a foolish person like grain in a bowl, you couldn’t remove the foolishness.
EAS Proverbs 27:22Even if you beat a fool with a big stick, as hard as you beat grain, you will never remove all his silly ideas.