Numbers 26:19
The sons of Judah were Er and Onan; and Er and Onan died in the land of Canaan.
Genesis 46:12
The sons of Judah: Er, Onan, Shelah, Perez, and Zerah (but Er and Onan died in the land of Canaan); and the sons of Perez were Hezron and Hamul.
Genesis 38:1-10
It happened at that time that Judah went down from his brothers and turned aside to a certain Adullamite, whose name was Hirah.
1 Chronicles 2:3-8
The sons of Judah: Er, Onan and Shelah; these three Bath-shua the Canaanite bore to him. Now Er, Judah's firstborn, was evil in the sight of the LORD, and he put him to death.