Matthew Henry Presbyterian @wholebiblehenry

Here we have, I. Orders given to Joshua to assign to each tribe its portion of this land, including that which was yet unsubdued, which must be brought into the lot, in a believing confidence that it should be conquered when Israel was multiplied so as to have occasion for it (Jos 13:7): Now divide this land. Joshua thought all must be conquered before any must be divided.

Commenting on Joshua 13:7-33

John Gill Reformed Baptist @doctorgill

And all the cities of the plain,.... In the champaign country, as well as those in the mountainous part: and all the kingdom of Sihon; or, as Masius renders the words, "which all had been the kingdom of Sihon"; for the whole kingdom of Sihon was not given to Reuben, only a part of it, and the rest to Gad, as in Jos 13:27, king...

Adam Clarke Methodist @methodicalclarke

Beth-peor - The house or temple of Peor, situated at the foot of the mountain of the same name. See Num 25:3.