Exodus 7:13, 16, 22

Still the king was stubborn and refused to listen to Moses and Aaron, just as the LORD had said.

Tell him: The LORD, the God of the Hebrews, sent me to you. He said, ‘Let my people go worship me in the desert.’ Until now you have not listened.

Using their tricks, the magicians of Egypt did the same thing. So the king was stubborn and refused to listen to Moses and Aaron, just as the LORD had said.