Exodus 12:29-30

29Now at midnight the LORD struck down every firstborn male in the land of Egypt, from the firstborn of Pharaoh, who sat on his throne, to the firstborn of the prisoner in the dungeon, as well as all the firstborn among the livestock.

30During the night Pharaoh got up—he and all his officials and all the Egyptians—and there was loud wailing in Egypt; for there was no house without someone dead.