Genesis 21:9-11

Darby Translation

⁹ And Sarah saw the son of Hagar the Egyptian, whom she had borne to Abraham, mocking.

¹⁰ And she said to Abraham, Cast out this handmaid and her son; for the son of this handmaid shall not inherit with my son—with Isaac.

¹¹ And the thing was very grievous in Abraham's sight because of his son.