1 Chronicles 1-2
The first nine chapters of 1 Chronicles gives the genealogies of key families from Adam to Abraham, and then the descendants of Abraham through the return of Judah following the Babylonian captivity.
Chapter 1 lists the descendants of Adam through Abraham, the descendants Ishmael, and the descendants of Isaac’s oldest son Esau.
Chapters 2-4 primarily focuses on the descendants of Judah, who was the fourth son of Jacob, through whom came king David, and the promise of the Lord’s Messiah (Who would be a descendant of David, and eventually sit on David’s throne).