16 and say to him, 'God, the God of the Hebrews, sent me to you with this message, "Release my people so that they can worship me in the wilderness." So far you haven't listened. 17 This is how you'll know that I am God. I am going to take this staff that I'm holding and strike this Nile River water: The water will turn to blood; 18 the fish in the Nile will die; the Nile will stink; and the Egyptians won't be able to drink the Nile water.'" 19 God said to Moses, "Tell Aaron, 'Take your staff and wave it over the waters of Egypt - over its rivers, its canals, its ponds, all its bodies of water - so that they turn to blood.' There'll be blood everywhere in Egypt - even in the pots and pans." 20 Moses and Aaron did exactly as God commanded them. Aaron raised his staff and hit the water in the Nile with Pharaoh and his servants watching. All the water in the Nile turned into blood. 21 The fish in the Nile died; the Nile stank; and the Egyptians couldn't drink the Nile water. The blood was everywhere in Egypt. 22 But the magicians of Egypt did the same thing with their incantations. Still Pharaoh remained stubborn. He wouldn't listen to them as God had said. 23 He turned on his heel and went home, never giving it a second thought. 24 But all the Egyptians had to dig inland from the river for water because they couldn't drink the Nile water.
25 Seven days went by after God had struck the Nile.
Matthew Henry's Commentary on Exodus 7:16-25
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.