Exodus 7:24

So all the Egyptians dug all around the river for water to drink, because they could not drink the water of the river.

Surrounding context

7:23 And Pharaoh turned and went into his house. Neither was his heart moved by this.

7:24 So all the Egyptians dug all around the river for water to drink, because they could not drink the water of the river.

7:25 And seven days passed after the LORD had struck the river.