And Moses said, "Thus says the LORD: About midnight I will go forth in the midst of Egypt;
and all the first-born in the land of Egypt shall die, from the first-born of Pharaoh who sits upon his throne, even to the first-born of the maidservant who is behind the mill; and all the first-born of the cattle.
And there shall be a great cry throughout all the land of Egypt, such as there has never been, nor ever shall be again.
But against any of the people of Israel, either man or beast, not a dog shall growl; that you may know that the LORD makes a distinction between the Egyptians and Israel.
And all these your servants shall come down to me, and bow down to me, saying, 'Get you out, and all the people who follow you.' And after that I will go out." And he went out from Pharaoh in hot anger.
Then the LORD said to Moses, "Pharaoh will not listen to you; that my wonders may be multiplied in the land of Egypt."
Moses and Aaron did all these wonders before Pharaoh; and the LORD hardened Pharaoh's heart, and he did not let the people of Israel go out of his land.