Exodus 7:22-24

New Century Version

²² Using their tricks, the magicians of Egypt did the same thing. So the king was stubborn and refused to listen to Moses and Aaron, just as the Lord had said. ²³ The king turned and went into his palace and ignored what Moses and Aaron had done. ²⁴ The Egyptians could not drink the water from the Nile, so all of them dug along the bank of the river, looking for water to drink.