Genesis 25:12
"Now these are the generations of Ishmael, Abraham’s son, whom Hagar the Egyptian, Sarah’s handmaid, bare unto Abraham:"
Cross References (ranked by relevance)
Psalm 83:6
The tabernacles of Edom, and the Ishmaelites; of Moab, and the Hagarenes;
Genesis 21:13
And also of the son of the bondwoman will I make a nation, because he is thy seed.
Genesis 17:20
And as for Ishmael, I have heard thee: Behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly; twelve princes shall he beget, and I will make him a great nation.