Genesis 35:22-26

While he was living there, Reuben had intercourse with Bilhah, his father’s concubine, and Jacob soon heard about it. These are the names of the twelve sons of Jacob: The sons of Leah were Reuben (Jacob’s oldest son), Simeon, Levi, Judah, Issachar, and Zebulun. The sons of Rachel were Joseph and Benjamin. The sons of Bilhah, Rachel’s servant, were Dan and Naphtali. The sons of Zilpah, Leah’s servant, were Gad and Asher. These are the names of the sons who were born to Jacob at Paddan-aram.