Exodus 11:4-7

4So Moses declared, “This is what the LORD says: ‘About midnight I will go throughout Egypt, 5and every firstborn son in the land of Egypt will die, from the firstborn of Pharaoh who sits on his throne, to the firstborn of the servant girl behind the hand mill, as well as the firstborn of all the cattle. 6Then a great cry will go out over all the land of Egypt. Such an outcry has never been heard before and will never be heard again. 7But among all the Israelites, not even a dog will snarl at man or beast.’1

Then you will know that the LORD makes a distinction between Egypt and Israel.