Narrated Abdullah bin Umar:
"Allah's Apostle gave the land of Khaibar to the Jews to work on and cultivate and take half of its yield. Ibn 'Umar added, "The land used to be rented for a certain portion (of its yield)." Nafi mentioned the amount of the portion but I forgot it. Rafi' bin Khadij said, "The 'Umar said: (The contract of Khaibar continued) till 'Umar evacuated the Jews (from Khaibar).