Exodus 7:24 YLT

²²  And the scribes of Egypt do so with their flashings, and the heart of Pharaoh is strong, and he hath not hearkened unto them, as Jehovah hath spoken,

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,