Numbers 19:9

19:9 “‘Then a man who is ceremonially clean must gather up the ashes of the red heifer and put them in a ceremonially clean place outside the camp. They must be kept for the community of the Israelites for use in the water of purification – it is a purification for sin.

Numbers 35:5

35:5 “You must measure from outside the wall of the town on the east 1,000 yards, and on the south side 1,000 yards, and on the west side 1,000 yards, and on the north side 1,000 yards, with the town in the middle. This territory must belong to them as grazing land for the towns.