Numbers 34:13-15

13So Moses commanded the Israelites, saying, “This is the land you are to inherit by lot, which the Lord has commanded to be given to the nine tribes and the half-tribe [of Manasseh],

14for the tribe of the sons of Reuben and the tribe of the sons of Gad have received their inheritance by their fathers’ households, and the half-tribe of Manasseh have received their possession.

15The two and a half tribes have received their inheritance across the Jordan [River] opposite Jericho, eastward toward the sunrise.”