14 And the Lord said to Moses and Aaron, Pharaoh's heart is unchanged; he will not let the people go. 15 Go to Pharaoh in the morning; when he goes out to the water, you will be waiting for him by the edge of the Nile, with the rod which was turned into a snake in your hand; 16 And say to him, The Lord, the God of the Hebrews, has sent me to you, saying, Let my people go so that they may give me worship in the waste land; but up to now you have not given ear to his words. 17 So the Lord says, By this you may be certain that I am the Lord; see, by the touch of this rod in my hand the waters of the Nile will be turned to blood; 18 And the fish in the Nile will come to destruction, and the river will send up a bad smell, and the Egyptians will not be able, for disgust, to make use of the water of the Nile for drinking. 19 And the Lord said, Say to Aaron, Let the rod in your hand be stretched out over the waters of Egypt, and over the rivers and the streams and the pools, and over every stretch of water, so that they may be turned to blood; and there will be blood through all the land of Egypt, in vessels of wood and in vessels of stone. 20 And Moses and Aaron did as the Lord had said; and when his rod had been lifted up and stretched out over the waters of the Nile before the eyes of Pharaoh and his servants, all the water in the Nile was turned to blood; 21 And the fish in the Nile came to destruction, and a bad smell went up from the river, and the Egyptians were not able to make use of the water of the Nile for drinking; and there was blood through all the land of Egypt. 22 And the wonder-workers of Egypt did the same with their secret arts: but Pharaoh's heart was made hard, and he would not give ear to them, as the Lord had said. 23 Then Pharaoh went into his house, and did not take even this to heart. 24 And all the Egyptians made holes round about the Nile to get drinking-water, for they were not able to make use of the Nile water.
Matthew Henry's Commentary on Exodus 7:14-24
Commentary on Exodus 7:14-25
(Read Exodus 7:14-25)
Here is the first of the ten plagues, the turning of the water into blood. It was a dreadful plague. The sight of such vast rolling streams of blood could not but strike horror. Nothing is more common than water: so wisely has Providence ordered it, and so kindly, that what is so needful and serviceable to the comfort of human life, should be cheap and almost every where to be had; but now the Egyptians must either drink blood, or die for thirst. Egypt was a pleasant land, but the dead fish and blood now rendered it very unpleasant. It was a righteous plague, and justly sent upon the Egyptians; for Nile, the river of Egypt, was their idol. That creature which we idolize, God justly takes from us, or makes bitter to us. They had stained the river with the blood of the Hebrews' children, and now God made that river all blood. Never any thirsted after blood, but sooner or later they had enough of it. It was a significant plague; Egypt had great dependence upon their river, Zechariah 14:18; so that in smiting the river, they were warned of the destruction of all the produce of their country. The love of Christ to his disciples changes all their common mercies into spiritual blessings; the anger of God towards his enemies, renders their most valued advantages a curse and a misery to them. Aaron is to summon the plague by smiting the river with his rod. It was done in the sight of Pharaoh and his attendants, for God's true miracles were not performed as Satan's lying wonders; truth seeks no corners. See the almighty power of God. Every creature is that to us which he makes it to be water or blood. See what changes we may meet with in the things of this world; what is always vain, may soon become vexatious. See what mischievous work sin makes. If the things that have been our comforts prove our crosses, we must thank ourselves. It is sin that turns our waters into blood. The plague continued seven days; and in all that time Pharaoh's proud heart would not let him desire Moses to pray for the removal of it. Thus the hypocrites in heart heap up wrath. No wonder that God's anger is not turned away, but that his hand is stretched out still.