Exodus 7:11-14 American Standard Version (ASV)

11. Then Pharaoh also called for the wise men and the sorcerers: and they also, the magicians of Egypt, did in like manner with their enchantments.

12. For they cast down every man his rod, and they became serpents: but Aaron’s rod swallowed up their rods.

13. And Pharaoh’s heart was hardened, and he hearkened not unto them; as Jehovah had spoken.

14. And Jehovah said unto Moses, Pharaoh’s heart is stubborn, he refuseth to let the people go.

Exodus 7