Cross reference
Numbers 26:19
19 Sons of Judah `are' Er and Onan; and Er dieth -- Onan also -- in the land of Canaan.
Genesis 46:12
12 And sons of Judah: Er, and Onan, and Shelah, and Pharez, and Zarah, (and Er and Onan die in the land of Canaan.) And sons of Pharez are Hezron and Hamul.
Genesis 38:1-10
1 And it cometh to pass, at that time, that Judah goeth down from his brethren, and turneth aside unto a man, an Adullamite, whose name `is' Hirah;
2 and Judah seeth there the daughter of a man, a Canaanite, whose name `is' Shuah, and taketh her, and goeth in unto her.
3 And she conceiveth, and beareth a son, and he calleth his name Er;
4 and she conceiveth again, and beareth a son, and calleth his name Onan;
5 and she addeth again, and beareth a son, and calleth his name Shelah; and he was in Chezib in her bearing him.
6 And Judah taketh a wife for Er, his first-born, and her name `is' Tamar;
7 and Er, Judah's first-born, is evil in the eyes of Jehovah, and Jehovah doth put him to death.
8 And Judah saith to Onan, `Go in unto the wife of thy brother, and marry her, and raise up seed to thy brother;'
9 and Onan knoweth that the seed is not `reckoned' his; and it hath come to pass, if he hath gone in unto his brother's wife, that he hath destroyed `it' to the earth, so as not to give seed to his brother;
10 and that which he hath done is evil in the eyes of Jehovah, and He putteth him also to death.
1 Chronicles 2:3-8
3 Sons of Judah: Er, and Onan, and Shelah, three have been born to him of a daughter of Shua the Canaanitess. And Er, first-born of Judah, is evil in the eyes of Jehovah, and He putteth him to death.
4 And Tamar his daughter-in-law hath borne to him Pharez and Zerah. All the sons of Judah `are' five.
5 Sons of Pharez: Hezron, and Hamul.
6 And sons of Zerah: Zimri, and Ethan, and Heman, and Calcol, and Dara; all of them five.
7 And sons of Carmi: Achar, troubler of Israel, who trespassed in the devoted thing.
8 And sons of Ethan: Azariah.