Exodus 12:29-32

At midnight the LORD struck down all the firstborn in Egypt, from the firstborn of Pharaoh, who sat on the throne, to the firstborn of the prisoner, who was in the dungeon, and the firstborn of all the livestock as well. Pharaoh and all his officials and all the Egyptians got up during the night, and there was loud wailing in Egypt, for there was not a house without someone dead. During the night Pharaoh summoned Moses and Aaron and said, “Up! Leave my people, you and the Israelites! Go, worship the LORD as you have requested. Take your flocks and herds, as you have said, and go. And also bless me.”