Exodus 7:22
The First Plague: Nile River Turned to Blood

And the magicians of Egypt did so with their enchantments: and Pharaoh's heart was hardened, neither did he hearken unto them; as the LORD had said.
Adjacent verses
Previous verse
Exodus 7:21
And the fish that was in the river died; and the river stank, and the Egyptians could not drink of the water of the river; and there was blood throughout all the land of Egypt.
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Exodus 7:23
And Pharaoh turned and went into his house, neither did he set his heart to this also.