John Gills Exposition of the Bible Commentary - Exodus 7:14
And the Lord said unto Moses, Pharaoh's heart is hardened ,.... Or "heavy" F3 כבד "grave", Montanus, Drusius. So Ainsworth. , dull and stupid, stiff and inflexible, cannot lift up his heart, or find in his heart to obey the will of God: he refuseth to let the people go ; which was an instance and proof of the hardness and heaviness of his heart, on which the above miracle had made no impression, to regard what God by his ambassadors had required of him. 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