Exodus 7:21-23

New Revised Standard Version, Anglicised

²¹ and the fish in the river died. The river stank so that the Egyptians could not drink its water, and there was blood throughout the whole land of Egypt. ²² But the magicians of Egypt did the same by their secret arts; so Pharaoh’s heart remained hardened, and he would not listen to them, as the Lord had said. ²³ Pharaoh turned and went into his house, and he did not take even this to heart.