Sahih Bukhari Volume 3, Book 36, Hadith Number 485.

Narated By 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 Prophet forbade renting farms.” Narrated ‘Ubaid-Ullah Nafi’ said: Ibn ‘Umar said: (The contract of Khaibar continued) till ‘Umar evacuated the Jews (from Khaibar).