Sayyiduna Mu'adh (may Allah be pleased with him) said: I was with the Messenger of Allah (peace and blessings be upon him) on a journey, and he seated me behind him on his mount. I never touched anything softer than the skin of the Messenger of Allah (peace and blessings be upon him), nor did I find any fragrance more pleasant than the fragrance of the Messenger of Allah (peace and blessings be upon him). He said: "O Mu'adh! Did you hear any sound tonight?" I said: No. He said: "A messenger from my Lord came to me and gave me the glad tidings that whoever of my Ummah dies without associating anything with Allah will enter Paradise." I said: O Messenger of Allah! Shall I not go out to the people and give them these glad tidings? He said: "Leave them, so that they strive to outdo one another on the path (of good deeds)."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17245