Exodus 7:17-25

17Thus saith Jehovah: In this shalt thou know that I am Jehovah — behold, I will smite with the staff that is in my hand upon the water which is in the river, and it shall be turned into blood. 18And the fish that is in the river shall die; and the river shall stink; and the Egyptians shall loathe to drink the water out of the river. 19And Jehovah said to Moses, Say unto Aaron, Take thy staff, and stretch out thy hand upon the waters of the Egyptians — upon their streams, upon their rivers, and upon their ponds, and upon all their reservoirs of water, that they may become blood; and there shall be blood throughout the land of Egypt, both in [vessels of] wood and in [vessels of] stone. 20And Moses and Aaron did so, as Jehovah had commanded; and he lifted up the staff, and smote the waters that were in the river before the eyes of Pharaoh, and before the eyes of his bondmen; and all the waters that were in the river were turned into 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 the blood was throughout the land of Egypt. 22And the scribes of Egypt did so with their sorceries; and Pharaoh's heart was stubborn, neither did he hearken to them, as Jehovah had said. 23And Pharaoh turned and went into his house, and took not this to heart either. 24And all the Egyptians dug round about the river for water to drink; for they could not drink of the water of the river. 25And seven days were fulfilled, after Jehovah had smitten the river.