It happened, while Yisra'el lived in that land, that Re'uven went and lay with Bilhah, his father's concubine, and Yisra'el heard of it. Now the sons of Ya`akov were twelve.
The sons of Yehudah: `Er, and Onan, and Shelach; which three were born to him of Shu`a's daughter the Kena`anite. `Er, Yehudah's firstborn, was wicked in the sight of the LORD; and he killed him.