Abu Dawud Book 13, Hadith Number 2963.

Narated By ‘Aisha, Ummul Mu’minin : Fatimah was demanding (the property of) sadaqah of the Apostle of Allah (PBUH) at Medina and Fadak, and what remained from the fifth of Khaybar. ‘Aisha quoted AbuBakr as saying: The Apostle of Allah (PBUH) said: We are not inherited; whatever we leave is sadaqah. The family of Muhammad will eat from this property, that is, from the property of Allah. They will not take more then their sustenance.