Genesis 35:21-23 King James Version (KJV)
21 And Israel journeyed, and spread his tent beyond the tower of Edar.
22 And it came to pass, when Israel dwelt in that land, that Reuben went and lay with Bilhah his father's concubine: and Israel heard it. Now the sons of Jacob were twelve:
23 The sons of Leah; Reuben, Jacob's firstborn, and Simeon, and Levi, and Judah, and Issachar, and Zebulun: