الكافي 2/2/20/6

6. A number of our people have narrated from Ahmad ibn Muhammad ibn Khalid from Isma’Il ibn Mehran from al-Hassan ibn Ali ibn abu Hamza from his father and Husayn ibn abu al-‘Ala’ from abu Basir who has said the following: “Abu ‘Abd Allah عليه السلام has said, ‘Whenever the Holy Prophet is mentioned, ask from Allah favors (in the form of al-Salat) for the Holy Prophet. Ask from Allah a great deal of favors for the Holy Prophet. Whoever does so once, Allah will do the same for him one thousand times in one thousand rows of angels and nothing will be left of the creatures of Allah without doing the same for that servant because of what Allah and angels have done. Whoever is not interested in it is ignorant and deceived, Allah, the Messenger of Allah and his family disavow him.’”