Exodus 12:29-30

29At midnight, the Lord killed all the firstborn sons in the land of Egypt. The firstborn son of Pharaoh, the king, died. But also, the firstborn son of any man who was in prison died. Every firstborn son in Egypt died. All the firstborn animals also died.

30Pharaoh and all his officers woke up in the middle of the night. All the Egyptians also woke up in the middle of the night. Everyone was crying loudly everywhere in Egypt. In every home, somebody had died that night.