John Gills Exposition of the Bible Commentary - Exodus 7:20
And Moses and Aaron did so, as the Lord commanded ,.... Moses delivered the rod to Aaron, who took it and went to the water side: and he lift up the rod, and smote the waters that were in the river ; or "in that river" F9 ביאר εν τω ποταμω Sept. "in eo rivo", Junius and Tremellius, Piscator. , the river Nile, on the brink of which Pharaoh then stood: in the sight of Pharaoh, and in the sight of his servants ; his nobles and courtiers who tended him in his walk to the water;... read more
Matthew Henry's Complete Commentary - Exodus 7:14-25
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. Nothing more common than water: so wisely has Providence ordered it, and so kindly, that that which is so needful and serviceable to the comfort of human life should be cheap,... read more