Genesis 25:19

19 And these are the generations of Isaac, son of Abraham. Abraham begat 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 And these are the years of the life of Ishmael, one hundred thirty-seven years; and Ishmael expired and died and was gathered unto his people.

18 And they dwelt from Havilah unto Shur, that is before Egypt, as thou goest toward Assyria; and he fell in the presence of all his brethren.

19 And these are the generations of Isaac, son of Abraham. Abraham begat Isaac;

20 and Isaac was forty years old when he took Rebekah to wife, the daughter of Bethuel, the Aramean of Padanaram, the sister to Laban the Aramean.

21 And Isaac prayed unto the LORD for his wife because she was barren; and the LORD accepted him, and Rebekah his wife conceived.