Exodus 11:5-7
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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. 6So there shall be a great cry in all the land of Egypt, such as there has not been before and such as shall never be again. 7But not even a dog will threaten any of the sons of Israel, nor anything from person to animal, so that you may learn how the Lord distinguishes between Egypt and Israel.’