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 mine hand upon the waters which are in the river, and they shall be turned to blood.
Thus saith the Lord, in this thou shalt know that I am the Lord,.... By the following instance of his power and vengeance:
behold, I will smite with the rod that is in my hand; which though in the hand of Moses, Exodus 7:18 yet he being his ambassador, and representing him, is said to be in the hand of the Lord; and with this he threatens to smite
upon the waters which are in the river; the river Nile, and the canals thereof:
and they shall be turned to blood; and if this river was their god, it would abundantly appear that the God of the Hebrews was Jehovah, and above all gods, and particularly above theirs.