Abu Hurayrah Radiyallahu 'Anhu says that Rasulullah Sallallahu 'Alayhi Wasallam said:
"My heirs must not distribute Dinars and Dirhams. From my assets, after deducting the expenditure of my women (family), and the 'aamils (workers). whatever is left over must be given in sadaqah".
English reference: Book 54, Hadith 386
Arabic reference: Book 55, Hadith 403