Bushayr bin Yasar (may Allah have mercy on him) said that the Messenger of Allah (peace and blessings be upon him) divided Khaybar into 36 shares. Eighteen shares were for the Messenger of Allah (peace and blessings be upon him), for the rights and the affairs of the people, and the other eighteen shares he distributed. He (peace and blessings be upon him) grouped eighteen men, then joined a hundred men to each man. [Sahih. It has preceded.]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / 20438