Numbers 35:3-4

35:3 Thus they will have towns in which to live, and their grazing lands will be for their cattle, for their possessions, and for all their animals. 35:4 The grazing lands around the towns that you will give to the Levites must extend to a distance of 500 yards ¹  from the town wall.

Numbers 35:7

35:7 “So the total of the towns you will give the Levites is forty-eight. You must give these together with their grazing lands.

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¹ tn Heb “one thousand cubits.” The standard cubit in the OT is assumed by most authorities to be about eighteen inches (45 cm) in length, so this would be a distance of 1,500 feet or 500 yards (675 meters).