John Gill Commentary 1 Chronicles 1:28

"The sons of Abraham: Isaac, and Ishmael." — 1 Chronicles 1:28 (ASV)

Ver. 28-34. The sons of Abraham

The famous and well known ancestor of the Jews; of Ishmael his firstborn, and his posterity; of his sons by Keturah; and of Isaac and his sons, an account is given from here to the end of (1 Chronicles 1:34) entirely agreeing with that in (Genesis 25:1–34) .