Keil & Delitzsch, on 1Chr 2:1

These are the sons of Israel,.... Or Jacob, the other son of Isaac, who had the name of Israel given him, because of his power with God, Gen 32:28, whose twelve sons are here mentioned by name; the first four according to their birth of Leah, Reuben, Simeon, Levi, and Judah; then the two sons of Zilpah, Leah's handmaid, Issachar and Zebulun; and between Dan and Naphtali, the sons of Bilhah, Rachel's handmaid, are placed Joseph and Benjamin, the sons of Rachel. , whose twelve sons are here mentioned by name; the first four according to their birth of Leah, Reuben, Simeon, Levi, and Judah; then the two sons of Zilpah, Leah's handmaid, Issachar and Zebulun; and between Dan and Naphtali, the sons of Bilhah, Rachel's handmaid, are placed Joseph and Benjamin, the sons of Rachel. 1 Chronicles 2:3 ch1 2:3 ch1 2:3 ch1 2:3The 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 Gen 38:2, 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, Gen 38:7.