Genesis 35:22-26

22While Israel was living in that land, Reuben went and slept with his father’s concubine Bilhah, and Israel heard about it. Now Jacob had twelve sons.

23Leah’s sons were Jacob’s firstborn Reuben, Simeon, Levi, Judah, Issachar and Zebulun.

24Rachel’s sons were Joseph and Benjamin.

25The sons of Bilhah, Rachel’s female servant, were Dan and Naphtali,

26and the sons of Zilpah, Leah’s female servant, were Gad and Asher. These are Jacob’s sons, who were born to him in Paddan-aram.