Exodus 7:22

And the charmers also of the Egyptians did so with their sorceries; and the heart of Pharao was hardened, and he did not listen to them, even as the Lord said.

And the magicians of Egypt did so with their enchantments: and Pharaoh’s heart was hardened, neither did he hearken unto them; as the Lord had said.

The magicians of Egypt did the same thing with their enchantments. So Pharaoh’s heart was hardened, and he didn’t listen to them, as Yahweh had spoken.