Numbers 35:3-5

3Thus they will have cities to live in and pastures for their cattle, flocks and all their livestock.

4The pastures you give the Levites will extend out from the walls around the cities for 1,000 cubits.

5You are to measure outside the cities 2,000 cubits on the east side, 2,000 cubits on the south side, on the west side 2,000 cubits, and on the north side 2,000 cubits. These are to be pasturelands for the cities.