17Thus says the LORD, By this you shall know that I am the LORD: behold, I will strike with the rod that is in my hand upon the waters which are in the river, and they shall be turned to blood.
18And the fish that are in the river shall die, and the river shall stink, and the Egyptians shall loathe to drink of the water of the river.
19And the LORD spoke to Moses, Say to Aaron, Take your rod, and stretch out your hand upon the waters of Egypt, upon their streams, upon their rivers, and upon their ponds, and upon all their pools of water, that they may become blood; and that there may be blood throughout all the land of Egypt, both in vessels of wood and in vessels of stone.
20And Moses and Aaron did so, as the LORD commanded; and he lifted up the rod, and struck the waters that were in the river, in the sight of Pharaoh, and in the sight of his servants; and all the waters that were in the river were turned to blood.
21And the fish that was in the river died; and the river stank, and the Egyptians could not drink the water of the river; and there was blood throughout all the land of Egypt.