Exodus 7:23-25

American Standard Version

²³ And Pharaoh turned and went into his house, neither did he ^[a]lay even this to heart. ²⁴ And all the Egyptians digged round about the river for water to drink; for they could not drink of the water of the river. ²⁵ And seven days were fulfilled, after that Jehovah had smitten the river.