1 Chronicles 2:3

The sons of Judah: Er, Onan, and Shelah; the three were born to him by Shua’s daughter the Canaanitess. Er, Judah’s eldest, was evil in the Lord’s sight, and He put him to death.

Genesis 38:2-10

There Judah saw a daughter of Shua, a Canaanite, and he took her [as his wife] and lived with her.

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.

Numbers 26:19

The sons of Judah were Er and Onan, but Er and Onan [were judged by God and] died in the land of Canaan.

1 Chronicles 9:5

From the Shilonites: 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: Asaiah the firstborn and his sons.
Genesis 38:2
There Judah saw a daughter of Shua, a Canaanite, and he took her [as his wife] and lived with her.
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.
Numbers 26:19
The sons of Judah were Er and Onan, but Er and Onan [were judged by God and] died in the land of Canaan.