Genesis 21:8-11

8The child grew stronger, and he began to eat food. On that day, Abraham prepared a big party meal.

9Then Sarah saw that Ishmael was laughing at Isaac. (Ishmael was the son of Abraham and Hagar, the Egyptian servant.)

10So Sarah said to Abraham, ‘Send that slave woman and her son away from here. Ishmael must never receive any of our family's things. Everything must belong to my own son, Isaac.’

11This made Abraham very sad, because Ishmael was his own son.