Moses
Exodus 7:16BSB·traditional attribution

Then say to him, ‘The LORD, the God of the Hebrews, has sent me to tell you: Let My people go, so that they may worship Me in the wilderness. But until now you have not listened.

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 thou shalt say unto him,.... Upon meeting him: the Lord God of the Hebrews hath sent me unto thee; still appearing in the character of the ambassador of Jehovah, the God of the children of Israel: saying, let my people go, that they may serve me in the wilderness; the demand is once more renewed, before any punishment is inflicted for refusal, that the...

Keil & Delitzsch Lutheran @keilanddelitzsch

Exo 7:14-21 The Water of the Nile Turned into Blood. - In the morning, when Pharaoh went to the Nile, Moses took his staff at the command of God; went up to him on the bank of the river, with the demand of Jehovah that he would let His people Israel go; and because hitherto (עד־כּה) he had not obeyed, announced this first plague, which Aaron immediately brought to pass.

Commenting on Exodus 7:14-21