Bereshis 21:7-9

Orthodox Jewish Bible

⁷ And she said, Who would have said unto Avraham, that Sarah should nurse banim? for I have borne him ben in his old age.

⁸ And the yeled grew, and was weaned; and Avraham made a mishteh gadol the same day that Yitzchak was weaned.

⁹ And Sarah saw the ben of Hagar the Egyptian, which she had borne unto Avraham, metzachek (mocking, scoffing).