11. Then Pharaoh called the wise men and the sorcerers. And they also, by Egyptian incantations and certain secrets, did similarly.
12. And each one cast down their staffs, and they were turned into serpents. But the staff of Aaron devoured their staffs.
13. And the heart of Pharaoh was hardened, and he did not listen to them, just as the Lord had instructed.
14. Then the Lord said to Moses: "The heart of Pharaoh has been hardened; he is not willing to release the people.
15. Go to him in the morning; behold, he will go out to the waters. And you will stand to meet him above the bank of the river. And you will take, in your hand, the staff that was turned into a serpent.
16. And you will say to him: 'The Lord God of the Hebrews sent me to you, saying: Release my people in order to sacrifice to me in the desert. And even until the present time, you were not willing to listen.
17. Therefore, thus says the Lord: In this you will know that I am the Lord. Behold, I will strike, with the staff that is in my hand, the water of the river, and it will be turned into blood.