Genesis 25:19

19 This is the family tree of Isaac son of Abraham: Abraham had Isaac.

Genesis 25:19 Meaning and Commentary

Genesis 25:19

And these [are] the generations of Isaac, Abraham's son
Moses, having given the genealogy of Ishmael and his posterity, returns to Isaac, the other son of Abraham, with whom and his children the following part of his history is chiefly, if not altogether concerned: Abraham begat Isaac;
for the further confirmation of his being his proper legitimate son this clause is added.

Genesis 25:19 In-Context

17 Ishmael lived 137 years. When he breathed his last and died he was buried with his family.

18 His children settled down all the way from Havilah near Egypt eastward to Shur in the direction of Assyria. The Ishmaelites didn't get along with any of their kin. Jacob and Rachel

19 This is the family tree of Isaac son of Abraham: Abraham had Isaac.

20 Isaac was forty years old when he married Rebekah daughter of Bethuel the Aramean of Paddan Aram. She was the sister of Laban the Aramean.

21 Isaac prayed hard to God for his wife because she was barren. God answered his prayer and Rebekah became pregnant.