Numbers 26:19

The sons of Judah: Er and Onan; and Er and Onan died in the land of Canaan.

Genesis 46:12

And the sons of Judah: Er, and Onan, and Shelah, and Pherez, and Zerah; but Er and Onan died in the land of Canaan. And the sons of Pherez were Hezron and Hamul.

Genesis 38:1-10

And it came to pass at that time, that Judah went down from his brethren, and turned in to a man of Adullam whose name was Hirah.

1 Chronicles 2:3-8

The sons of Judah: Er, and Onan, and Shelah: which three were born to him of the daughter of Shua the Canaanitess. And Er, Judah's firstborn, was wicked in the sight of Jehovah; and he slew him.

Treasury of Scripture Knowledge

Summary

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

General references

Bible References

Er and onan

Genesis 38:1
And it came to pass at that time, that Judah went down from his brethren, and turned in to a man of Adullam whose name was Hirah.
Genesis 46:12
And the sons of Judah: Er, and Onan, and Shelah, and Pherez, and Zerah; but Er and Onan died in the land of Canaan. And the sons of Pherez were Hezron and Hamul.
1 Chronicles 2:3
The sons of Judah: Er, and Onan, and Shelah: which three were born to him of the daughter of Shua the Canaanitess. And Er, Judah's firstborn, was wicked in the sight of Jehovah; and he slew him.

General references

Numbers 1:26
Of the sons of Judah: their generations, after their families, according to their fathers' houses, by the number of the names, from twenty years old and upward, all that went forth to military service: