Genesis
Chapters 21:7-13
King James Version, American Edition
7And she said, Who would have said unto Abraham, that Sarah should have given children suck? for I have borne him a son in his old age.
8And the child grew, and was weaned: and Abraham made a great feast the same day that Isaac was weaned.
9And Sarah saw the son of Hagar the Egyptian, which she had borne unto Abraham, mocking.
10Wherefore she said unto Abraham, Cast out this bondwoman and her son: for the son of this bondwoman shall not be heir with my son, even with Isaac.
11And the thing was very grievous in Abraham's sight because of his son.
12And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said unto thee, hearken unto her voice; for in Isaac shall thy seed be called.
13And also of the son of the bondwoman will I make a nation, because he is thy seed.