Sahih Muslim
The Book of Jihad and Expedition (Kitab Al-Jihad wal-Siyar)
Book Number: 019 / Hadith Number: 4351
It is narrated on the authority of 'A'isha who said: When the Messenger of Allah (may peace be upon him) passed away, his wives made up their minds to send 'Uthman b. 'Affan (as their spokesman) to Abu Bakr to demand from him their share from the legacy of the Holy Prophet (may peace be upon him). (At this), A'isha said to them: Hasn't the Messenger of Allah (may peace be upon him) said:" We (Prophets) do not have any heirs; what we leave behind is (to be given in) charity"?