“For I will go through the land of Egypt on that night and strike down every firstborn, both men and animals, and I will execute judgments against all the gods of Egypt. I am Adonai.
So it came about at midnight that Adonai struck down all the firstborn in the land of Egypt, from the firstborn of Pharaoh sitting on his throne to the firstborn of the captive who was in the dungeon, and all the firstborn cattle.