Abu Dawud Book 15, Hadith Number 3315.
Chapter : Not known.
Narated By Ka’b ibn Malik : I said: Apostle of Allah, to make my atonement complete I should divest myself of my all property as sadaqah (alms) for Allah and His apostle. He said: No. I said: The half of it. He said: No. I said: Then a third of it. He said: Yes. I said: I shall retain the portion I have at Khaybar.