Genesis 35:22-24

Revised Standard Version

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.