Exodus 12:29-33

29And it came to pass that at midnight Jehovah smote all the firstborn in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the captive that was in the dungeon, and all the firstborn of cattle.

30And Pharaoh rose up in the night, he, and all his bondmen, and all the Egyptians; and there was a great cry in Egypt; for there was not a house in which there was not one dead.

31And he called Moses and Aaron in the night, and said, Rise up, go away from among my people, both ye and the children of Israel; and go, serve Jehovah, as ye have said.

32Also take your flocks and your herds, as ye have said, and go; and bless me also.

33And the Egyptians urged the people, to send them out of the land in haste; for they said, We are all dead [men]!