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 all the Egyptians digged round about the river,.... On each side of it, in order to get clear water; and Aben Ezra thinks the Hebrews also, who were affected with this, and the two following plagues, the frogs and lice: but it is much more reasonable to conclude that they were free from them all.

Keil & Delitzsch Lutheran @keilanddelitzsch

Exo 7:22-25 This miracle was also imitated by the magicians. The question, where they got any water that was still unchanged, is not answered in the biblical text. Kurtz is of opinion that they took spring water for the purpose; but he has overlooked the fact, that if spring water was still to be had, there would be no necessity for the Egyptians to dig...

Commenting on Exodus 7:22-25