John Gill Commentary Numbers 35:7

"All the cities which ye shall give to the Levites shall be forty and eight cities; them [shall ye give] with their suburbs." — Numbers 35:7 (ASV)

So all the cities which you shall give to the Levites shall be
forty eight cities
Of these forty eight cities, their names, and what tribes they were in, and which of them were particularly cities of refuge, an account is given in (Joshua 21:10–37) :

them shall you give, with their suburbs ;
according to the dimensions before prescribed.