سنن ابن ماجه

It was narrated that Anas bin Malik said: "The Messenger of Allah (ﷺ) said: 'May Allah cause to flourish a slave (of His) who hears my words and understands them, then he conveys them from me. There are those who have knowledge but no understanding, and there may be those who convey knowledge to those who may have more understanding of it than they do.'"