1 Chronicles 2:3, 4

The sons of Judah: Er, Onan and Shelah. These three were born to him by a Canaanite woman, the daughter of Shua. Er, Judah’s firstborn, was wicked in the LORD’s sight; so the LORD put him to death.

Judah’s daughter-in-law Tamar bore Perez and Zerah to Judah. He had five sons in all.