Had there been a prophet after the Prophet ﷺ, his son Ibrahim would not have died.
حدثنا وكيع حدثنا ابن أبي خالد قال سمعت
لو كان بعد النبي ﷺ نبي ما مات ابنه إبراهيم
Its isnad is sahih, and it is found in Ibn Majah 1/484, no. 1511, in the Book of Funerals, chapter on what has been said about the funeral prayer for the son of the Messenger of Allah ﷺ.