الكافي 2/1/83/10

10. A number of our people have narrated from Sahl ibn Ziyad from Muhammad ibn ‘Uramah from al-Hassan ibn Ali ibn abu Hamza from his father from abu Basir who has said the following: “Abu ‘Abd Allah عليه السلام has said, ‘Compete in al-Ma’ruf doing good to your brothers (in belief) and be of such people; in paradise there is a door called al-Ma’ruf through which no one can enter except those who have performed al-Ma’ruf (a virtuous deed) in the worldly life. If a servant (of Allah) walks to help his believing brother (in belief), Allah, the Most Majestic, the Most Holy, appoints two angels one from the right and one from the left to ask forgiveness for him from his Lord and pray for his wish to come true.’ The Imam then said, ‘By Allah, the Messenger of Allah becomes happier for the coming true of the wish of the needy believer than the needy believer himself.’”