Genesis 21:9-10

21:9 But Sarah noticed the son of Hagar the Egyptian – the son whom Hagar had borne to Abraham – mocking. 21:10 So she said to Abraham, “Banish that slave woman and her son, for the son of that slave woman will not be an heir along with my son Isaac!”

Genesis 35:29

35:29 Then Isaac breathed his last and joined his ancestors. He died an old man who had lived a full life. His sons Esau and Jacob buried him.