Abu Dawud
Tributes, Spoils And Rulership
Book Number: 013 / Hadith Number: 3001
Narated By Abdullah ibn Umar : Umar said: The Apostle of Allah (pbuh) had transaction with the Jews of Khaybar on condition that we should expel them when we wish. If anyone has property (with them), he should take it back, for I am going to expel the Jews. So he expelled them.