Sahih Bukhari
One-fifth of Booty to the Cause of Allah (Khumus)
Volume: 004 / Book Number: 053 / Hadith Number: 330
Narrated 'Amr bin Al-Harith:
The Prophet did not leave anything (after his death) except his arms, a white mule, and a (piece of) land which he had given as Sadaqa.