Exodus 7:21-23

Living Bible

²¹ The fish died and the water became so foul that the Egyptians couldn’t drink it; and there was blood throughout the land of Egypt. ²² But then the magicians of Egypt used their secret arts and they, too, turned water into blood; so Pharaoh’s heart remained hard and stubborn, and he wouldn’t listen to Moses and Aaron, just as the Lord had predicted, ²³ and he returned to his palace, unimpressed.