Genesis 35:21-23

Revised Standard Version

²¹ Israel journeyed on, and pitched his tent beyond the tower of Eder.

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.