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:
The sons of Judah; Er, and Onan, and Shelah: which three were born unto him of Bath-shua the Canaanitess. And Er, Judah's firstborn, was wicked in the sight of the LORD; and he slew him.