Bilangan 35:4

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.

Bilangan 35:27

35:27 and the avenger of blood finds him outside the borders of the town of refuge, and the avenger of blood kills the slayer, he will not be guilty of blood,

[35:4]  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).