Genesis 35:22-24 Common English Bible (CEB)
22 While Israel stayed in that place, Reuben went and slept with Bilhah his father’s secondary wife, and Israel heard about it.
Jacob had twelve sons. 23 The sons of Leah were Reuben, Jacob’s oldest son, and Simeon, Levi, Judah, Issachar, and Zebulun. 24 The sons of Rachel were Joseph and Benjamin.