And the child grew and was weaned, and Avraham made a great feast on the day Yitzchak was weaned. And Shem and Ever and all the great ones of the land came, and Avimelech king of the Philistines and his servants and Pichol the captain of his army, and Terach the father of Avraham and Nachor his brother came from Charan with all that they had. And they rejoiced and ate and drank at the feast that Avraham made on the day he weaned Yitzchak.

And Terach and Nachor stayed with him in the land of the Philistines for many days [(Sefer HaYashar). And in the Seder HaKabbalah it is written that when Avraham was one hundred and two years old (this is Year 2051), Yitzchak was weaned and Hagar and her son were expelled, and at that time Yishmael was seventeen years old (and so it says in the Midrash on Vayera twice that he was seventeen years old)].

Yitzchak was bound at the Akeidah when he was two years old [(this is Year 2050)]. And so it appears in the chapter on Nachum: "There is no doubt that the Akeidah was immediately after he was weaned," and in Sefer Shema Shlomo he wrote that this is forced (see Year 2085).