Genesis 35:22-24 New International Reader's Version (NIRV)
22 While Israel was living in that area, Reuben went in and slept with Bilhah. She was the concubine of Reuben’s father. And Israel heard about it.
Here are the 12 sons Jacob had.
23 Leah was the mother of
Reuben, Jacob’s oldest son.
Her other sons were Simeon, Levi, Judah, Issachar and Zebulun.
24 The sons of Rachel were
Joseph and Benjamin.