Reuben was Israel's oldest son, but he lost his birthright because he had sexual relations with his father's concubine (Genesis 35:22). Jacob gave this right to Joseph by making Ephraim and Manasseh full members of the tribes (Genesis 48:5). This act gave Joseph the double portion usually meant for the firstborn (Deuteronomy 21:15–17). As Jacob predicted, Judah became more prominent than his brothers and was the ancestor of the ruling tribe (Genesis 49:8–10). However, Reuben is still listed first (1 Chronicles 2:1).