51 The oldest son of Israel was Reuben. But since he dishonored his father by sleeping with one of his father's concubines, his birthright was given to the sons of his brother Joseph. For this reason, Reuben is not listed in the genealogical records as the firstborn son.
Matthew Henry's Commentary on 1 Chronicles 5:1
Chapter Contents
Genealogies.
This chapter gives some account of the two tribes and a half seated on the east side of Jordan. They were made captives by the king of Assyria, because they had forsaken the Lord. Only two things are here recorded concerning these tribes. 1. They all shared in a victory. Happy is that people who live in harmony together, who assist each other against the common enemies of their souls, trusting in the Lord, and calling upon him. 2. They shared in captivity. They would have the best land, not considering that it lay most exposed. The desire of earthly objects draws to a distance from God's ordinances, and prepares men for destruction.