Exodus 7:20-22

Holman Christian Standard Bible

²⁰ Moses and Aaron did just as the Lord had commanded; in the sight of Pharaoh and his officials, he raised the staff and struck the water in the Nile, and all the water in the Nile was turned to blood.^{(A) 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.