Genesis 35:21-23 Modern English Version (MEV)
21 Israel journeyed and pitched his tent beyond the tower of Eder. 22 When Israel lived in that land, Reuben went and lay with Bilhah, his father’s concubine, and Israel heard about it.
Now the sons of Jacob were twelve:
23 The sons of Leah were
Reuben, Jacob’s firstborn,
and Simeon and Levi and Judah and Issachar and Zebulun.