Joshua 21:10

which went to the descendants of Aaron , one of the clans of the Kohathites who belonged to the people of Levi ; since the lot fell to them first .

(these towns were assigned to the descendants of Aaron who were from the Kohathite clans of the Levites, because the first lot fell to them):

Which the children of Aaron, being of the families of the Kohathites, who were of the children of Levi, had: for theirs was the first lot.