Numbers 32:1-5, 33-42

Now the sons of Reuben and the sons of Gad had very large herds of cattle, and they saw the land of Jazer and the land of Gilead [on the east side of the Jordan River], and indeed, the place was suitable for raising livestock. So the sons of Gad and of Reuben came and spoke to Moses, to Eleazar the priest, and to the leaders of the congregation, saying, “[The country around] Ataroth, Dibon, Jazer, Nimrah, Heshbon, Elealeh, Sebam, Nebo, and Beon, the land which the LORD conquered before the congregation of Israel, is a land [suitable] for livestock, and your servants have [very large herds of] livestock.” They said, “If we have found favor in your sight, let this land be given to your servants as a possession. Do not take us across the Jordan [River].”

So Moses gave to them, to the sons of Gad and to the sons of Reuben and to the half-tribe of Manasseh the son of Joseph, the kingdom of Sihon, the king of the Amorites and the kingdom of Og, the king of Bashan, the land with its cities and territories, the cities of the surrounding land. The sons of Gad built Dibon, Ataroth, Aroer, Atroth-shophan, Jazer, Jogbehah, Beth-nimrah, and Beth-haran, fortified (walled) cities, and sheepfolds for sheep. The sons of Reuben built Heshbon, Elealeh, Kiriathaim, Nebo, and Baal-meon (their names being changed) and Sibmah; and they gave other names to the cities which they built. The sons of Machir the son of Manasseh went to Gilead and took it, and drove out the Amorites who were in it. So Moses gave Gilead to [the tribe of] Machir the son of Manasseh, and they settled in it. [The sons of] Jair the son of Manasseh went and took its towns (tent villages) and called them Havvoth-jair. Nobah went and took Kenath and its villages, and called it Nobah after his own name.