Joshua 13:8

8 Half the tribe of Manasseh and the tribes of Reuben and Gad had already received their grants of land on the east side of the Jordan, for Moses, the servant of the LORD, had previously assigned this land to them.

Joshua 13:8 Meaning and Commentary

Joshua 13:8

With whom the Reubenites and the Gadites have received their
inheritance
That is, along with the half tribe of Manasseh, but not with that half of it before mentioned, who was to haven division of a part with the nine tribes, but with the other half of the tribe settled beyond Jordan; with them the tribes of Reuben and Gad had received their portion at their own request, and so were to have no share in the present distribution:

which Moses gave them beyond Jordan eastward;
at their desire, ( Numbers 32:1-5 ) , and upon certain conditions to be performed by them, ( Numbers 32:20-23 ) ;

[even] as Moses the servant of the Lord gave them;
this character of Moses, as the "servant of the Lord", seems to be observed to show that he gave the said tribes their inheritance: according to the will of God, and in obedience to it: here end the words of the Lord to Joshua, and next follows an account of the land given to the two tribes and a half described by the writer of this book.

Joshua 13:8 In-Context

6 and all the hill country from Lebanon to Misrephoth-maim, including all the land of the Sidonians. “I myself will drive these people out of the land ahead of the Israelites. So be sure to give this land to Israel as a special possession, just as I have commanded you.

7 Include all this territory as Israel’s possession when you divide this land among the nine tribes and the half-tribe of Manasseh.”

8 Half the tribe of Manasseh and the tribes of Reuben and Gad had already received their grants of land on the east side of the Jordan, for Moses, the servant of the LORD, had previously assigned this land to them.

9 Their territory extended from Aroer on the edge of the Arnon Gorge (including the town in the middle of the gorge) to the plain beyond Medeba, as far as Dibon.

10 It also included all the towns of King Sihon of the Amorites, who had reigned in Heshbon, and extended as far as the borders of Ammon.