Genesis 21:7-9

King James Version

⁷ And she said, Who would have said unto Abraham, that Sarah should have given children suck? for I have born him a son in his old age.

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.