Proverbs 9:9
Instruct a wise man, and he will be wiser still; teach a righteous man, and he will increase his learning.
Berean Standard Bible
Give instruction to a wise man, and he will be yet wiser: teach a just man, and he will increase in learning.
Instruct a wise person, and he will be still wiser. Teach a righteous person, and he will increase in learning.