Exodus 7:21-23

Holman Christian Standard Bible

²¹ The fish in the Nile died, and the river smelled so bad the Egyptians could not drink water from it. There was blood throughout the land of Egypt.

²² But the magicians of Egypt did the same thing by their occult practices. So Pharaoh’s heart hardened, and he would not listen to them, as the Lord had said. ²³ Pharaoh turned around, went into his palace, and didn’t even take this to heart.