Exodus 7:17-18

New International Version - UK

¹⁷ This is what the Lord says: by this you will know that I am the Lord: with the staff that is in my hand I will strike the water of the Nile, and it will be changed into blood. ¹⁸ The fish in the Nile will die, and the river will stink; the Egyptians will not be able to drink its water.”’