Sahih Bukhari Volume 008, Book 075, Hadith Number 344.
Narated By Ibn Abi Aufa : Whenever a man brought his alms to the Prophet, the Prophet would say, "O Allah! Bestow Your Blessing upon the family of so-and-so." When my father came to him (with his alms), he said, "O Allah! Bestow Your Blessings upon the family of Abi Aufa."