Genesis 21:8-10

King James Version

⁸ And the child grew, and was weaned: and Abraham made a great feast the same day that Isaac was weaned.

⁹ And Sarah saw the son of Hagar the Egyptian, which she had born unto Abraham, mocking.

¹⁰ Wherefore 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.