Numbers 32:31-33

31The tribes of Gad and Reuben answered, “Sir, we will do as the Lord has said.

32We will enter Canaan as armed troops in the Lord’s presence, but the land we will take possession of is here, east of the Jordan.”

33So Moses gave the tribes of Gad, Reuben, and half of the tribe of Manasseh, son of Joseph, the kingdoms of King Sihon of the Amorites and King Og of Bashan—the whole land with its cities and its surrounding territory.