1 Chronicles 2:3

The sons of Judah were Er, Onan and Shelah; these three were born to him by Bath-shua the Canaanitess. And Er, Judah’s firstborn, was wicked in the sight of the Lord, so He put him to death.

Genesis 38:2-10

Judah saw there a daughter of a certain Canaanite whose name was Shua; and he took her and went in to her.

Genesis 46:12

The sons of Judah: Er and Onan and Shelah and Perez and Zerah (but Er and Onan died in the land of Canaan). And the sons of Perez were Hezron and Hamul.

Numbers 26:19

The sons of Judah were Er and Onan, but Er and Onan died in the land of Canaan.

1 Chronicles 9:5

From the Shilonites were Asaiah the firstborn and his sons.

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
From the Shilonites were Asaiah the firstborn and his sons.
Genesis 38:2
Judah saw there a daughter of a certain Canaanite whose name was Shua; and he took her and went in to her.
Genesis 46:12
The sons of Judah: Er and Onan and Shelah and Perez and Zerah (but Er and Onan died in the land of Canaan). And the sons of Perez were Hezron and Hamul.
Numbers 26:19
The sons of Judah were Er and Onan, but Er and Onan died in the land of Canaan.