Exodus Chapter 11 World English Bible
and all the firstborn in the land of Egypt shall die, from the firstborn of Pharaoh who sits on his throne, even to the firstborn of the maid-servant who is behind the mill; and all the firstborn of cattle.
But against any of the children of Israel a dog won't even bark or move its tongue, against man or animal; that you may know that Yahweh makes a distinction between the Egyptians and Israel.
All these your servants shall come down to me, and bow down themselves to me, saying, 'Get out, and all the people who follow you; and after that I will go out.'" He went out from Pharaoh in hot anger.