It was narrated from Zaid bin Thabit that:
The Messenger of Allah 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.' " (One of the narrators) 'Ali bin Muhammed added to it: "There are three things because of which hatred does not enter the heart of a Muslim: Sincerity in doing an action for the sake of Allah; being sincere towards the rulers of the Muslims; and adhering to the Jama'ah (main body of the Muslims."
English reference: Vol. 1, Book 1, Hadith 230
Arabic reference: Book 1, Hadith 235