1 Chronicles 5:1-2
The Family of Reuben
1-2The family of Reuben the firstborn of Israel: Though Reuben was Israel's firstborn, after he slept with his father's concubine, a defiling act, his rights as the firstborn were passed on to the sons of Joseph son of Israel. He lost his "firstborn" place in the family tree. And even though Judah became the strongest of his brothers and King David eventually came from that family, the firstborn rights stayed with Joseph.
3The sons of Reuben, firstborn of Israel: Hanoch, Pallu, Hezron, and Carmi.