Abu Dawud Book 13, Hadith Number 2961.

Narated By Umar ibn al-Khattab : Malik ibn Aws al-Hadthan said: One of the arguments put forward by Umar was that he said that the Apostle of Allah (PBUH) received three things exclusively to himself: Banu an-Nadir, Khaybar and Fadak. The Banu an-Nadir property was kept wholly for his emergent needs, Fadak for travellers, and Khaybar was divided by the Apostle of Allah (PBUH) into three sections: two for Muslims, and one as a contribution for his family. If anything remained after making the contribution of his family, he divided it among the poor Emigrants.