Exodus 7:13, 16, 22

Yet Pharaoh’s heart became hard and he would not listen to them, just as the LORD had said.

Then say to him, ‘The LORD, the God of the Hebrews, has sent me to say to you: Let my people go, so that they may worship me in the wilderness. But until now you have not listened.

But the Egyptian magicians did the same things by their secret arts, and Pharaoh’s heart became hard; he would not listen to Moses and Aaron, just as the LORD had said.