Genesis 35:22-26 Revised Standard Version (RSV)
22 While Israel dwelt in that land Reuben went and lay with Bilhah his father’s concubine; and Israel heard of it.
Now the sons of Jacob were twelve. 23 The sons of Leah: Reuben (Jacob’s first-born), Simeon, Levi, Judah, Is′sachar, and Zeb′ulun. 24 The sons of Rachel: Joseph and Benjamin. 25 The sons of Bilhah, Rachel’s maid: Dan and Naph′tali. 26 The sons of Zilpah, Leah’s maid: Gad and Asher. These were the sons of Jacob who were born to him in Paddan-aram.