Numbers 32:33-42
So Moses gave to the Gadites, to the Reubenites, and to the half-tribe of Manasseh son of Joseph, the kingdom of Sihon king of the Amorites and the kingdom of Og king of Bashan--the land including its cities and the territory surrounding them. . . .

Deuteronomy 3:16, 17
and to the Reubenites and Gadites I gave the territory from Gilead to the Arnon Valley (the middle of the valley was the border) and up to the Jabbok River, the border of the Ammonites. . . .

Joshua 12:1-6
Now these are the kings of the land whom the Israelites struck down and whose lands they took beyond the Jordan to the east, from the Arnon Valley to Mount Hermon, including all the Arabah eastward: . . .

Joshua 13:8-12
The other half of Manasseh, along with the Reubenites and Gadites, had received the inheritance Moses had given them beyond the Jordan to the east, just as Moses the servant of the LORD had assigned to them: . . .