Moses and Aaron did all these great miracles in front of the king. But the Lord made him stubborn, and the king would not let the Israelites leave his country.
The Lord said to Moses, “When you get back to Egypt, do all the miracles I have given you the power to do. Show them to the king of Egypt. But I will make the king very stubborn, and he will not let the people go.
The king sent people to see what had happened to the animals of Israel, and they found that not one of them had died. But the king was still stubborn and did not let the people go.
“He has blinded their eyes, and he has closed their minds. Otherwise they would see with their eyes and understand in their minds and come back to me and be healed.”
The Lord made those people stubborn so they would fight against Israel and he could completely destroy them without mercy. This is what the Lord had commanded Moses to do.