The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fada'il Al-Sahabah)
Muslim :: Book 31 : Hadith 5880
Abu Huraira reported that Allah's Messenger (may peace be upon him) said: Who amongst you is observing fastthis day? Abu Bake said: It is I. He (again) said: Who amongst you has followed the bier today? Abu Bakr said: It is I. He (the Holy Prophet) again said: Who amongst you has served food to the needy? Abu Bakr said: It is I. He (again) said: Who amongst you has today visited the sick? Abu Bakr said: It is I. Thereupon Allah's Messenger (may peace be upon him) said: He must get into Paradise who combines in himself (all these noble qualities and virtues).