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 6059
Anas reported that Umm Sulaim said (to the Holy Prophet) Allah's Messenger, here is your servant Anas, invoke blessings of Allah upon him. Thereupon he (the Holy Prophet) said: O Allah, make an increase in his wealth, and progeny, and confer blessings upon him in everything Thou hast bestowed upon him.