1 Chronicles 2:3 (BSB)

The sons of Judah: Er, Onan, and Shelah. These three were born to him by Bath-shua the Canaanite. Er, Judah’s firstborn, was wicked in the sight of the LORD. So the LORD put him to death.

From 1 Chronicles 2. Also in the ESV.

Commentary on 1 Chronicles 2:3

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on 1 Chronicles 2:1-17: Here is, I. The family of Jacob. His twelve sons are here named, that illustrious number so often celebrated almost throughout the whole Bible, from the first to the last book of it. At every turn we meet with the twelve tribes that descended from these twelve patriarchs.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on 1 Chronicles 2:3: And Tamar his daughter in law bare him Pharez and Zerah,.... Through incest; they were twins, Gen 38:27 all the sons of Judah were five; who are before mentioned by name. all the sons of Judah were five; who are before mentioned by name. 1 Chronicles 2:5 ch1 2:5 ch1 2:5 ch1 2:5The sons of Pharez,.... One of the above twins, born to Judah: Hezron and Hamul; see Gen 46:12.
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on 1 Chronicles 2:3: The sons of Judah; Er, and Onan, and Shelah: [which] three were born unto him of the daughter of Shua the Canaanitess. And Er, the firstborn of Judah, was evil in the sight of the LORD; and he slew him. (a) Though Judah was not Jacob's eldest son, yet he first begins with him, because he would come to the genealogy of David, of whom came Christ.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on 1 Chronicles 2:3-5: 1Ch 2:3-5 The sons of Judah and of Pharez, 1Ch 2:3.f. - The five sons of Judah are given according to Gen 38, as the remark on Er which is quoted from Gen 38:7 of that chapter shows, while the names of the five sons are to be found also in Gen 46:12. The two sons of Pharez are according to Gen 46:12, cf. Num 26:21.