Exodus 7
10 Ref Moses and Aaron went in to Pharaoh, and they did so, as Yahweh had commanded: and Aaron cast down his rod before Pharaoh and before his servants, and it became a serpent.
11 Ref Then Pharaoh also called for the wise men and the sorcerers. They also, the magicians of Egypt, did in like manner with their enchantments.
12 Ref For they cast down every man his rod, and they became serpents: but Aaron's rod swallowed up their rods.
13 Ref Pharaoh's heart was hardened, and he didn't listen to them; as Yahweh had spoken.
14 Ref Yahweh said to Moses, "Pharaoh's heart is stubborn. He refuses to let the people go.
15 Ref Go to Pharaoh in the morning. Behold, he goes out to the water; and you shall stand by the river's bank to meet him; and the rod which was turned to a serpent you shall take in your hand.