Numbers 26:56

According to the lot shall the possession thereof be divided between many and few. Thus the relative situation of each tribe's inheritance in Canaan was determined and, at the same time, all cause for dispute removed.

Notwithstanding the land shall be divided by lot, not only to avoid all dissatisfaction and complaint, but also to cause every tribe to accept the territory assigned to it as the gift of God, for so the outcome of the lot was generally regarded; according to the names of the tribes of their fathers they shall inherit.