Exodus 7:13, 16, 22

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

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

But the magicians of Egypt did the same by their secret arts and enchantments; so Pharaoh’s heart was hardened, and he did not listen to Moses and Aaron, just as the LORD had said.