Exodus 12:29-30

29Now at midnight the Lord struck every firstborn male in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the prisoner who was in the dungeon, and every firstborn of the livestock.

30During the night Pharaoh got up, he along with all his officials and all the Egyptians, and there was a loud wailing throughout Egypt because there wasn’t a house without someone dead.