Bereshis 21:9-11

Orthodox Jewish Bible

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

¹⁰ Therefore she said unto Avraham, Cast out this bondwoman and her ben: for the ben of this bondwoman shall not be heir with beni (my son), even with Yitzchak.

¹¹ And the thing was very grievous in the eyes of Avraham because of bno.