Numbers 32:40

And the rest of Gilead, and all Bashan, being the kingdom of Og, gave I unto the half tribe of Manasseh; all the region of Argob, with all Bashan, which was called the land of giants. Jair the son of Manasseh took all the country of Argob unto the coasts of Geshuri and Maachathi; and called them after his own name, Bashanhavothjair, unto this day. And I gave Gilead unto Machir.

And Moses gave inheritance unto the half tribe of Manasseh: and this was the possession of the half tribe of the children of Manasseh by their families. And their coast was from Mahanaim, all Bashan, all the kingdom of Og king of Bashan, and all the towns of Jair, which are in Bashan, threescore cities: And half Gilead, and Ashtaroth, and Edrei, cities of the kingdom of Og in Bashan, were pertaining unto the children of Machir the son of Manasseh, even to the one half of the children of Machir by their families.

There was also a lot for the tribe of Manasseh; for he was the firstborn of Joseph; to wit, for Machir the firstborn of Manasseh, the father of Gilead: because he was a man of war, therefore he had Gilead and Bashan.