Exodus 7:19-21

¹⁹Then the Lord said to Moses, “Say to Aaron, ‘Take your staff and extend your hand over the waters of Egypt, over their rivers, over their streams, over their pools, and over all their reservoirs of water, so that they may become blood; and there will be blood through all the land of Egypt, both in containers of wood and in containers of stone.’ ”

²⁰So Moses and Aaron did just as the Lord had commanded. And he lifted up the staff and struck the water that was in the Nile in the sight of Pharaoh and in the sight of his servants; and all the water that was in the Nile was turned into blood. ²¹Then the fish that were in the Nile died, and the Nile stank, so that the Egyptians could not drink water from the Nile. And the blood was through all the land of Egypt.