The sons of Judah: Er, and Onan, and Shelah, which three were born to him of Shua's daughter the Canaanitess. And Er, Judah's first-born, was wicked in the sight of LORD, and he killed him.
And it came to pass, while Israel dwelt in that land, that Reuben went and lay with Bilhah his father's concubine, and Israel heard of it. Now the sons of Jacob were twelve.