All these wonders Moses and Aaron did before Pharaoh: but the Lord made Pharaoh's heart hard, and he did not let the children of Israel go out of his land.
And when Pharaoh made his heart hard and would not let us go, the Lord sent death on all the first sons in Egypt, of man and of beast: and so every first male who comes to birth is offered to the Lord; but for all the first of my sons I give a price.
And the Lord said to Moses, When you go back to Egypt, see that you do before Pharaoh all the wonders which I have given you power to do: but I will make his heart hard and he will not let the people go.
And the Lord said to Moses, Now you will see what I am about to do to Pharaoh; for by a strong hand he will be forced to let them go, driving them out of his land because of my outstretched arm.
And Pharaoh sent and got word that there was no loss of any of the cattle of Israel. But the heart of Pharaoh was hard and he did not let the people go.