John Gill Commentary Numbers 35:8

"And concerning the cities which ye shall give of the possession of the children of Israel, from the many ye shall take many; and from the few ye shall take few: every one according to his inheritance which he inheriteth shall give of his cities unto the Levites." — Numbers 35:8 (ASV)

And the cities which you shall give shall be of the possession
of the children of Israel
What shall fall by lot for their inheritance, and they shall be possessed of; and though they are, shall not refuse, nor grudge to give them, according to the direction of God, whose the land is, they holding it under him:

from [them that have] many you shall give many, but from [them that
have] few you shall give few ;
which rule was observed; for out of Judah, whose lot was large, and out of Simeon, whose inheritance was within that of Judah, because it was so large, nine cities were given, whereas out of the other tribes only four cities out of each were given, and out of one of them but three, see (Joshua 21:1–45) ,

everyone shall give of his cities unto the Levites, according to his
inheritance which he inheriteth ;
and the Levites, being thus dispersed among the several tribes, were of great advantage to them, to instruct them in the knowledge of divine things; so that though hereby Jacob's curse on this tribe had its fulfilment, that it should be divided in Jacob, and scattered in Israel, yet that became a blessing to the rest of the tribes; see (Genesis 49:7) .