Sahih Muslim
The Book of Jihad and Expedition (Kitab Al-Jihad wal-Siyar)
Book Number: 019 / Hadith Number: 4355
It has been narrated on the authority of Abu Huraira that the Messenger of Allah (may peace be upon him) said: My heirs cannot share even a dinar (from my legacy) ; what I leave behind after paving mtintenance allowance to my wives and remuneration to my manager is (to go in) charity.