Commentary for Proverbs 9:9

Give a wise man, and he will become yet wiser To a worthy pupil, and the Midrash Aggadah (Tanchuma, Vayakhel 6) states: It was said to Noah, “From every clean animal, etc.” (Gen. 7:2), and when he went out, “And he took from all clean animals, etc.” (ibid. 8:20). He said, “What did the Holy One, blessed be He, see to increase the number of these? It is only because He wished that I offer up some of them.”

teach a righteous man wisdom, and he will increase in learning from his own knowledge in addition to what he heard.