Genesis 21:9 BBE

⁷  And she said, Who would have said to Abraham that Sarah would have a child at her breast? for see, I have given him a son now when he is old.

⁸  And when the child was old enough to be taken from the breast, Abraham made a great feast.

⁹  And Sarah saw the son of Hagar the Egyptian playing with Isaac.

¹⁰  So she said to Abraham, Send away that woman and her son: for the son of that woman is not to have a part in the heritage with my son Isaac.

¹¹  And this was a great grief to Abraham because of his son.