1 Chronicles 2:3-5

a The sons of Judah: b Er, Onan and Shelah; these three Bath-shua the Canaanite bore to him. Now Er, Judah’s firstborn, was evil in the sight of the  Lord, and he put him to death. His daughter-in-law c Tamar also bore him Perez and Zerah. Judah had five sons in all.

The d sons of Perez: Hezron and Hamul.
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