The sons of Reuben, Israel’s firstborn: Hanoch, Pallu, Hezron, and Carmi.

These were the sons of Israel: ¹  Reuben, Simeon, Levi, and Judah; Issachar and Zebulun;

The clans of Merari’s descendants were allotted twelve cities within the territory of the tribes of Reuben, Gad, and Zebulun. ¹ 

Within the territory of the tribe of Reuben across the Jordan River east of Jericho: ¹  Bezer in the desert and its pasturelands, Jahzah and its pasturelands,

The sons of Reuben, Israel’s firstborn – (Now he was the firstborn, but when he defiled his father’s bed, ¹  his rights as firstborn were given to the sons of Joseph, Israel’s son. So Reuben is not listed as firstborn in the genealogical records. ² 

The Reubenites, Gadites, and the half-tribe of Manasseh had 44,760 men in their combined armies, warriors who carried shields and swords, were equipped with bows, and were trained for war. ¹