Numbers 35:4-6

Revised Standard Version

⁴ The pasture lands of the cities, which you shall give to the Levites, shall reach from the wall of the city outward a thousand cubits all round. ⁵ And you shall measure, outside the city, for the east side two thousand cubits, and for the south side two thousand cubits, and for the west side two thousand cubits, and for the north side two thousand cubits, the city being in the middle; this shall belong to them as pasture land for their cities. ⁶ The cities which you give to the Levites shall be the six cities of refuge, where you shall permit the manslayer to flee, and in addition to them you shall give forty-two cities.