Sahih Muslim Book 31, Hadith Number 5880.
Chapter : The merits of Abu Bakr Siddiq (Allah be pleased with him).
Abu Huraira reported that Allah’s Messenger (may peace be upon him) said: Who amongst you is observing fast this day? Abu Bakr 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).