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.
The sons of Judah were: Er, Onan, and Shelah; these three Bathshua, a Canaanite woman, bore to him. But Judah’s firstborn, Er, was wicked in the sight of the Lord, so he took his life.