Numbers 35:6-8

6Six of the Levites' towns must be safe places. If anyone kills another person, he can run there to be safe. The Levites must also have another 42 towns.

7In that way, the Levites will have 48 towns and land for their animals.

8Each of the Israelite tribes must give to the Levites towns from their own land. The larger tribes will give more towns. The smaller tribes will give fewer towns. That is because the larger tribes have received more land than the smaller tribes.’