Exodus 7:22

²⁰And Moses and Aaron did so, as the Lord commanded them; and Aaron having lifted up his hand with his rod, smote the water in the river before Pharaoh, and before his servants, and changed all the water in the river into blood.

²¹And the fish in the river died, and the river stank thereupon; and the Egyptians could not drink water from the river, and the blood was in all the land of Egypt.

— Exodus 7:22 —

²³And Pharaoh turned and entered into his house, nor did he fix his attention even on this thing.

²⁴And all the Egyptians dug round about the river, so as to drink water, for they could not drink water from the river.