Bereshis 17:17-19

Orthodox Jewish Bible

¹⁷ Then Avraham fell upon his face, and yitzchak (laughed), and said in his lev, Shall a child be born unto him that is a hundred shanah? And shall Sarah, that is ninety shanah, bear?

¹⁸ And Avraham said unto HaElohim, O that Yishmael might live before Thee!

¹⁹ And Elohim said, Sarah thy isha shall bear thee ben indeed; and thou shalt call shmo Yitzchak; and I will establish My Brit (covenant) with him for a Brit Olam, and with his zera after him.