1 Chronicles 2:3-4

Judah had three sons from Bathshua, a Canaanite woman. Their names were Er, Onan, and Shelah. But the LORD saw that the oldest son, Er, was a wicked man, so he killed him. Later Judah had twin sons from Tamar, his widowed daughter-in-law. Their names were Perez and Zerah. So Judah had five sons in all.