From Sahih Muslim (Hadith 6372):
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
Reference: Muslim 6372