Numbers 35:3-5

3Then they will have towns to live in and pasturelands for the cattle they own and all their other animals.

4“The pasturelands around the towns that you give the Levites will extend a thousand cubits from the town wall.

5Outside the town, measure two thousand cubits on the east side, two thousand on the south side, two thousand on the west and two thousand on the north, with the town in the center. They will have this area as pastureland for the towns.