First Chronicles explicitly interprets Reuben’s defilement of his father’s bed in Genesis 35 as the offense that cost him the birthright, supplying a later biblical explanation of the consequence of Reuben’s act.

First Chronicles explicitly recalls Reuben defiling his father’s bed and losing the birthright, directly interpreting the Genesis history behind Jacob’s rebuke in Genesis 49. The later genealogy explains why firstborn status did not determine Israel’s later leadership and inheritance structure.

First Chronicles explicitly interprets the family inheritance structure behind Genesis 48: Reuben lost his birthright, and that birthright was given to the sons of Joseph, corresponding to Jacob’s elevation of Ephraim and Manasseh into direct tribal standing and Joseph’s resulting double share.