Musnad Ahmad 937:125

Affan narrated to us, Mahdi narrated to us, Wasil al-Ahdab narrated to us, from Ma'rur ibn Suwayd, from Abu Dharr, from the Prophet, may Allah bless him and grant him peace, that he said: I heard him saying: "Someone came to me from my Lord and informed me—or he said: gave me glad tidings (Mahdi was uncertain)—that whoever among my nation dies not associating anything with Allah will enter Paradise." I said: "Even if he committed adultery and even if he stole?" He said: "Even if he committed adultery and even if he stole."