Genesis 35:22-23 ▼

22 While Israel was encamped in that region, Reuben went and lay with Bilhah, his father’s concubine. When Israel heard of it, he was greatly offended. The sons of Jacob were now twelve.

23 The sons of Leah: Reuben, Jacob’s firstborn, Simeon, Levi, Judah, Issachar, and Zebulun;