Genesis 21:9-13

9And Sarah saw the son of Hagar the Egyptian, which she had borne to Abraham, mocking. 10Therefore she said to 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 to Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said to thee, hearken to 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.