Muhammed bin Jubair bin Mut'im narrated that his father said: "The Messenger of Allah stood up at Khaif in Mina and said: 'May Allah cause his face to shine, the man who hears what I say and conveys it (to others). There are those who have knowledge but no understanding, and there may be those who convey knowledge to those who have more understanding of it than they do.'" (Hasan)Other chains with similar wording.