Exodus 7:23-25

Young's Literal Translation

²³ and Pharaoh turneth and goeth in unto his house, and hath not set his heart even to this;

²⁴ and all the Egyptians seek water round about the river to drink, for they have not been able to drink of the waters of the River.

²⁵ And seven days are completed after Jehovah's smiting the River,