Sahih Bukhari – Hadith No : 4293

Narrated `Abdullah: The Prophet gave (the land of) Khaibar to the Jews (of Khaibar) on condition that they would work on it and cultivate it and they would have half of its yield.

Hadith In Arabic Text :

حدثنا موسى بن إسماعيل، حدثنا جويرية، عن نافع، عن عبد الله رضى الله عنه قال أعطى النبي صلى الله عليه وسلم خيبر اليهود أن يعملوها ويزرعوها، ولهم شطر ما يخرج منها‏.‏

Chapter : Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi) – كتاب المغازى