Sunan Abi Dawud, Hadith 3409

Narrated Ibn 'Umar: The Prophet handed over the Jews of Khaibar the palm trees and the land of Khaibar on condition that they should employ what belonged to them in working on them, and that he should have half of the fruits.

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، عَنِ اللَّيْثِ، عَنْ مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ، - يَعْنِي ابْنَ غَنَجٍ - عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم دَفَعَ إِلَى يَهُودِ خَيْبَرَ نَخْلَ خَيْبَرَ وَأَرْضَهَا عَلَى أَنْ يَعْتَمِلُوهَا مِنْ أَمْوَالِهِمْ وَأَنَّ لِرَسُولِ اللَّهِ صلى الله عليه وسلم شَطْرَ ثَمَرَتِهَا ‏.‏

sunnah.com

also referenced under: Hadith 3402 (Hasan)