And when he was living in that region, Reuben went out, and he slept with Bilhah the concubine of his father, which was not such a small matter as to be hidden from him. Now the sons of Jacob were twelve.
The sons of Judah: Er, Onan, and Shelah. These three were born to him from the daughter of Shua, the Canaanite. But Er, the firstborn of Judah, was evil in the sight of the Lord, and so he killed him.