35:1 The Lord spoke to Moses in the plains of Moab by the Jordan at Jericho, saying, 2 “Command the people of Israel to give to the Levites some of the inheritance of their possession as cities for them to dwell in. And you shall give to the Levites pasturelands around the cities. 3 The cities shall be theirs to dwell in, and their pasturelands shall be for their cattle and for their livestock and for all their beasts. 4 The pasturelands of the cities, which you shall give to the Levites, shall reach from the wall of the city outward a thousand cubits  all around. 5 And you shall measure, outside the city, on the east side two thousand cubits, and on the south side two thousand cubits, and on the west side two thousand cubits, and on the north side two thousand cubits, the city being in the middle. This shall belong to them as pastureland for their cities.
6 “The cities that 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. 7 All the cities that you give to the Levites shall be forty-eight, with their pasturelands. 8 And as for the cities that you shall give from the possession of the people of Israel, from the larger tribes you shall take many, and from the smaller tribes you shall take few; each, in proportion to the inheritance that it inherits, shall give of its cities to the Levites.”
9 And the Lord spoke to Moses, saying, 10 “Speak to the people of Israel and say to them, When you cross the Jordan into the land of Canaan, 11 then you shall select cities to be cities of refuge for you, that the manslayer who kills any person without intent may flee there. 12 The cities shall be for you a refuge from the avenger, that the manslayer may not die until he stands before the congregation for judgment. 13 And the cities that you give shall be your six cities of refuge. 14 You shall give three cities beyond the Jordan, and three cities in the land of Canaan, to be cities of refuge. 15 These six cities shall be for refuge for the people of Israel, and for the stranger and for the sojourner among them, that anyone who kills any person without intent may flee there. (ESV)
 35:4 A cubit was about 18 inches or 45 centimeters