Volume 1, Book 3, Number 131:

Narrated Anas: I was informed that the Prophet had said to Mu'adh, "Whosoever will meet Allah without associating anything in worship with Him will go to Paradise." Mu'adh asked the Prophet, "Should I not inform the people of this good news?" The Prophet replied, "No, I am afraid, lest they should depend upon it (absolutely)."