Treasury of Scripture Knowledge
Summary
                            The sons of Judah; Er, and Onan, and Shelah: which three were born unto him of the daughter of Shua the Canaanitess. And Er, the firstborn of Judah, was evil in the sight of the LORD; and he slew him.                        
                    Bible References
Er, and
                                        1 Chronicles 9:5                                        
                                                                                                                                Of the Shilonites: Asaiah the firstborn and his sons.
                                    
                                        Genesis 38:2                                        
                                                                                                                                Judah met a young Canaanite woman there whose father was named Shua. He married her.
                                    
                                        Genesis 46:12                                        
                                                                                                                                The sons of Judah were Er, Onan, Shelah, Perez, and Zerah. (Er and Onan died in Canaan.) The sons of Perez were Hezron and Hamul.
                                    
                                        Numbers 26:19                                        
                                                            
                        Er and Onan were sons of Judah, but they died in Canaan.