Exodus 7:20-22

Revised Geneva Translation

²⁰ So, Moses and Aaron did just as the LORD commanded. And he lifted up the rod and struck the water that was in the river in the sight of Pharaoh, and in the sight of his servants. And all the water that was in the river was turned into blood.

²¹ And the fish that were in the river died, and the river stank, so that the Egyptians could not drink the water of the river. And there was blood throughout the land of Egypt.

²² And the enchanters of Egypt did the same with their sorceries. And the heart of Pharaoh was hardened, so that he did not listen to them (as the LORD had said).