Moses
Exodus 7:23BSB·traditional attribution

Instead, Pharaoh turned around, went into his palace, and did not take any of this to heart.

John Calvin Reformed @genevareformer

23. And Pharaoh turned. In this word Moses teaches us that the hardness of heart, to which God had devote Pharaoh, was voluntary; so that the sin rested in himself, nor did the secret appointment of God avail anything to lessen his culpability, for his folly is condemned, because he did not “set his heart to this also.” Whence it follows that he was the...

Matthew Henry Presbyterian @wholebiblehenry

Here is the first of the ten plagues, the turning of the water into blood, which was, 1. A dreadful plague, and very grievous. The very sight of such vast rolling streams of blood, pure blood no doubt, florid and high-colored, could not but strike a horror upon people: much more afflictive were the consequences of it.

Commenting on Exodus 7:14-25

John Gill Reformed Baptist @doctorgill

And Pharaoh turned, and went into his house,.... Turned away from Moses and Aaron, and turned back from the river to which he came, and went to his palace in the city; it being perhaps now about dinner time, when all before related had passed: neither did he set his heart to this also: had no regard to this miracle of turning the waters into...