Genesis 35
22 Ref It happened, while Israel lived in that land, that Reuben went and lay with Bilhah, his father's concubine, and Israel heard of it. Now the sons of Jacob were twelve.
23 Ref The sons of Leah: Reuben (Jacob's firstborn), Simeon, Levi, Judah, Issachar, and Zebulun.
24 Ref The sons of Rachel: Joseph and Benjamin.
25 Ref The sons of Bilhah (Rachel's handmaid): Dan and Naphtali.
26 Ref The sons of Zilpah (Leah's handmaid): Gad and Asher. These are the sons of Jacob, who were born to him in Paddan Aram.