Exodus 11:4-5
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The Last Plague
4Then Moses said, “This is what the Lord says: ‘About midnight I am going out into the midst of Egypt, 5and all the firstborn in the land of Egypt shall die, from the firstborn of the Pharaoh who sits on his throne, to the firstborn of the slave girl who is behind the millstones; all the firstborn of the cattle as well.
Exodus 11:4-5 (NASB)