Sahih Muslim , Book 22, Hadith 1 (In-Book) ⓘ
Ibn Umar (Allah be pleased with them) reported that Allah's Messenger contracted with the people of Khaibar the (trees) on the condition that he would have half the produce in fruits and harvest.
حَدَّثَنَا أَحْمَدُ بْنُ حَنْبَلٍ، وَزُهَيْرُ بْنُ حَرْبٍ، - وَاللَّفْظُ لِزُهَيْرٍ - قَالاَ حَدَّثَنَا يَحْيَى، - وَهُوَ الْقَطَّانُ - عَنْ عُبَيْدِ اللَّهِ، أَخْبَرَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم عَامَلَ أَهْلَ خَيْبَرَ بِشَطْرِ مَا يَخْرُجُ مِنْهَا مِنْ ثَمَرٍ أَوْ زَرْعٍ .
also referenced under: Hadith 1551 (Reference) & Book 10, Hadith 3758 (USC-MSA)