Exodus 7:14

12For they each cast down their rods, and they became serpents; but Aaron’s rod swallowed up their rods.

13Pharaoh’s heart was hardened, and he didn’t listen to them, as the LORD had spoken.

14The LORD said to Moses, “Pharaoh’s heart is stubborn. He refuses to let the people go.

15Go to Pharaoh in the morning. Behold, he is going out to the water. You shall stand by the river’s bank to meet him. You shall take the rod which was turned to a serpent in your hand.

16You shall tell him, ‘The LORD, the God of the Hebrews, has sent me to you, saying, “Let my people go, that they may serve me in the wilderness. Behold, until now you haven’t listened.”