Exodus 7:13 in the World English Bible
Pharaoh’s heart was hardened, and he didn’t listen to them, as the LORD had spoken.
Context
12 For they cast down every man his rod, and they became serpents: but Aaron’s rod swallowed up their rods.
13 And he hardened Pharaoh’s heart, that he hearkened not unto them; as the LORD had said.
14 And the LORD said unto Moses, Pharaoh’s heart is hardened, he refuseth to let the people go.