Exodus 7:13, 16, 22

Yet Pharaoh’s heart was hardened, and he did not listen to them, as the LORD had said.

You shall say to him, ‘The LORD, the God of the Hebrews, sent me to you, saying, “Let My people go, that they may serve Me in the wilderness. But behold, you have not listened until now.”

But the magicians of Egypt did the same with their secret arts; and Pharaoh’s heart was hardened, and he did not listen to them, as the LORD had said.