English Standard Version
Chapter 7 16
And you shall say to him, ‘The LORD, the God of the Hebrews, sent me to you, saying, “Let my people go, that they may serve me in the wilderness.” But so far, you have not obeyed. 17
Thus says the LORD, “By this you shall know that I am the LORD: behold, with the staff that is in my hand I will strike the water that is in the Nile, and it shall turn into blood.