Numbers 35:3-5

3The cities shall be theirs to live in; and their pasture lands shall be for their cattle and for their herds and for all their livestock.

4“The pasture lands around the cities which you shall give to the Levites shall reach from the wall of the city and outward a thousand cubits (1,500 ft.) around.

5You shall also measure outside the city on the east, south, west, and north sides two thousand cubits (3,000 ft.), with the city in the center. This shall belong to the Levites as pasture lands for the cities.