And Moses said, Thus saith the LORD, About midnight will I go out into the midst of Egypt: And all the firstborn in the land of Egypt shall die, from the firstborn of Pharaoh that sitteth upon his throne, even unto the firstborn of the maidservant that is behind the mill; and all the firstborn of beasts. And there shall be a great cry throughout all the land of Egypt, such as there was none like it, nor shall be like it any more. Exodus 11:14-16
Each day Ra was to rise in the morning as a boy-god named Khepri, then at mid-day he became a falcon headed man and at sunset he travels to death in the underworld as an old man named Atum. Except the heir to the throne didn't rise the next day this time. The son of pharaoh was dead-and remains so to this day.
