Exodus 7:12 KJV

For they cast down every man his rod, and they became serpents: but Aaron’s rod swallowed up their rods.
Exodus 7:12, King James Version

In context

11 Then Pharaoh also called the wise men and the sorcerers: now the magicians of Egypt, they also 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 he hardened Pharaoh’s heart, that he hearkened not unto them; as the Lord had said.