The Book of Zakat (Kitab Al-Zakat)
Muslim :: Book 5 : Hadith 2358
'Abdullah b. Abu Aufa said that it was the common practice of the Mes- senger of Allah (may peace be upon him) that when the people brought to him sadaqa he blessed them: 0 Allah, bless them. So when Abu Aufa brought to him Sadaqa he (the Holy Prophet) said: 0 Allah, bless, the posterity of Abu Aufa.