Exodus 7:21-23

Revised Geneva Translation

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).

²³ Then Pharaoh returned and went back into his house; and this still did not enter into his heart.