Numbers 26:52-56

Then the LORD said to Moses, “Divide the land among the tribes, and distribute the grants of land in proportion to the tribes’ populations, as indicated by the number of names on the list. Give the larger tribes more land and the smaller tribes less land, each group receiving a grant in proportion to the size of its population. But you must assign the land by lot, and give land to each ancestral tribe according to the number of names on the list. Each grant of land must be assigned by lot among the larger and smaller tribal groups.”