Genesis 38:3

She conceived and gave birth to a son, and he named him Er.

Judah’s sons: Er, Onan, Shelah, Perez, and Zerah; but Er and Onan died in the land of Canaan.
Perez’s sons: Hezron and Hamul.

Judah’s sons included Er and Onan, but they died in the land of Canaan.

Treasury of Scripture Knowledge

And she conceived, and bare a son; and he called his name Er.

Judah’s sons: Er, Onan, Shelah, Perez, and Zerah; but Er and Onan died in the land of Canaan.
Perez’s sons: Hezron and Hamul.

Judah’s sons included Er and Onan, but they died in the land of Canaan.