Exodus 7:21-23

Amplified Bible

²¹ The fish in the Nile died, and the river became foul smelling, and the Egyptians could not drink its water, and there was blood throughout ^[a]all the land of Egypt. ²² But the magicians of Egypt did the ^[b]same by their secret arts and enchantments; so Pharaoh’s heart was hardened, and he did not listen to Moses and Aaron, just as the Lord had said. ²³ Then Pharaoh turned and went into his house, and he did not take even this [divine sign] to heart.