Matthew Poole and continuators on Joshua 19:1

ANd the second lot came forth to Simeon, even for the Tribe of the Children of Simeon, according to their families: and their inheritance was within the inheritance of the children of Judah .

This was so ordered by Gods Providence, partly to fulfil that threatning that he would divide and scatter this Tribe in Israel, Gen. 49. 7. which was hereby done in part, because they had no distinct part of their own, but were as Inmates to Iudah; partly, because now upon the more exact survey of the Land, it appeared to Ioshua and Eleazar, and all the Princes and People, even to the Tribe of Iudah themselves, that the Part given to Iudah did far exceed the Proportion which either they needed and could occupy, or which the other Tribes could expect; and partly, because this was the least of the Tribes: as is evident from Numb. 26. 14. and therefore fittest to be put within another Tribe.