Numbers 18:30

18:30 “Therefore you will say to them, ‘When you offer up the best of it, then it will be credited to the Levites as the product of the threshing floor and as the product of the winepress.

Numbers 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 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.