Bushayr bin Yasar (may Allah have mercy on him) (a freed slave of the Ansar) narrates from Companions of the Messenger of Allah (peace and blessings be upon him) (may Allah be pleased with them) that when the Prophet (peace and blessings be upon him) conquered Khaybar, he (peace and blessings be upon him) divided it into 36 shares. He (peace and blessings be upon him) made each share comprise a hundred shares. Half of it was for the Messenger of Allah (peace and blessings be upon him) and the Muslims, and he set aside the remaining half for the delegations, affairs and calamities that befell people.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / 20437