This is what the LORD says: By this you will know that I am the LORD. Behold, with the staff in my hand I will strike the water of the Nile, and it will turn to blood.
Jewish Publication Society of America Version (JPS1917) - Exodus 7:17 >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.