Exodus 7:21-23

Young's Literal Translation

²¹ and the fish which [is] in the River hath died, and the River stinketh, and the Egyptians have not been able to drink water from the River; and the blood is in all the land of Egypt.

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;