Exodus 7:15-17

New Revised Standard Version, Anglicised

¹⁵ Go to Pharaoh in the morning, as he is going out to the water; stand by at the river bank to meet him, and take in your hand the staff that was turned into a snake. ¹⁶ Say to him, “The Lord, the God of the Hebrews, sent me to you to say, ‘Let my people go, so that they may worship me in the wilderness.’ But until now you have not listened. ¹⁷ Thus says the Lord, ‘By this you shall know that I am the Lord.’ See, with the staff that is in my hand I will strike the water that is in the Nile, and it shall be turned to blood.