1 Chronicles 2:3

3 The sons of Judah: Er and Onan and Shelah; these three were his sons by Bathshua, the Canaanite woman. And Er, Judah's oldest son, did evil in the eyes of the Lord; and he put him to death.

1 Chronicles 2:3 Meaning and Commentary

1 Chronicles 2:3

The sons of Judah
The genealogy begins with him, though the fourth son of Jacob; because, as Kimchi says, this book treats chiefly of the kings of Judah; but rather not only because Jesse and David sprang from him, but also the King Messiah:

Er, and Onan, and Shelah, which three were born unto him of the
daughter of Shua the Canaanitess;
see ( Genesis 38:2 Genesis 38:12 ) ,

and Er, the firstborn of Judah, was evil in the sight of the Lord;
because he did that which was evil:

and he slew him;
he died by the immediate hand of God, and so his brother Onan, being wicked also, ( Genesis 38:7 Genesis 38:10 ) .

1 Chronicles 2:3 In-Context

1 These are the sons of Israel: Reuben, Simeon, Levi and Judah, Issachar and Zebulun;

2 Dan, Joseph and Benjamin, Naphtali, Gad and Asher.

3 The sons of Judah: Er and Onan and Shelah; these three were his sons by Bathshua, the Canaanite woman. And Er, Judah's oldest son, did evil in the eyes of the Lord; and he put him to death.

4 And Tamar, his daughter-in-law, had Perez and Zerah by him. All the sons of Judah were five.

5 The sons of Perez: Hezron and Hamul.