Exodus 7:13
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.
Exodus თავი 7