8. And the LORD spoke to Moses, and to Aaron, saying,
9. When Pharaoh shall speak to you, saying, Show a miracle for you: then thou shalt say to Aaron, Take thy rod, and cast it before Pharaoh, and it shall become a serpent.
10. And Moses and Aaron went in to Pharaoh, and they did so as the LORD had commanded: And Aaron cast down his rod before Pharaoh, and before his servants, and it became a serpent.
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 to them; as the LORD had said.
14. And the LORD said to Moses, Pharaoh's heart is hardened; he refuseth to let the people go.
15. Go to Pharaoh in the morning; lo, he goeth out to the water, and thou shalt stand by the river's brink against he cometh; and the rod which was turned to a serpent shalt thou take in thy hand.
16. And thou shalt say to him, The LORD God of the Hebrews hath sent me to thee, saying, Let my people go, that they may serve me in the wilderness: and behold, hitherto thou wouldest not hear.
17. Thus saith the LORD, In this thou shalt know that I am the LORD: behold, I will smite with the rod that is in my hand upon the waters which are in the river, and they shall be turned to blood.