Albert Barnes Commentary Numbers 35:5

"And ye shall measure without 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 midst. This shall be to them the suburbs of the cities." — Numbers 35:5 (ASV)

From without the city — Omit “from.” The demarcation here intended would run parallel to the wall of the city, outside which it was made. To guard against any restrictions of area, due to such causes as the irregular forms of the cities or the physical obstacles of the ground, it was ordained that the suburb should, alike on north, south, east, and west, present, at a distance of one thousand cubits (or, nearly one-third of a mile) from the wall, a front not less than two thousand cubits in length; and, by joining the extremities of these measured fronts according to the nature of the ground, a sufficient space for the Levites would be secured.