71 And Jehovah said to Moses, See, I have made thee God to Pharaoh; and Aaron thy brother shall be thy prophet. 2 Thou shalt speak all that I command thee; and Aaron thy brother shall speak unto Pharaoh, that he let the children of Israel go out of his land. 3 And I will render Pharaoh's heart obdurate, and multiply my signs and my wonders in the land of Egypt. 4 And Pharaoh will not hearken unto you; and I will lay my hand upon Egypt, and bring forth my hosts, my people, the children of Israel, out of the land of Egypt by great judgments. 5 And the Egyptians shall know that I am Jehovah, when I stretch forth my hand on Egypt, and bring out the children of Israel from among them. 6 And Moses and Aaron did as Jehovah had commanded them: so did they. 7 And Moses was eighty years old, and Aaron was eighty-three years old, when they spoke to Pharaoh.

Aaron's Rod

8 And Jehovah spoke to Moses and to Aaron, saying, 9 When Pharaoh shall speak to you, saying, Do a miracle for yourselves,—then thou shalt say unto Aaron, Take thy staff and cast [it] before Pharaoh—it will become a serpent. 10 And Moses and Aaron went in to Pharaoh, and did so, as Jehovah had commanded; and Aaron cast down his staff before Pharaoh, and before his bondmen, and it became a serpent. 11 And Pharaoh also called the sages and the sorcerers; and they too, the scribes of Egypt, did so with their enchantments: 12 they cast down every man his staff, and they became serpents; but Aaron's staff swallowed up their staves. 13 And Pharaoh's heart was stubborn, and he hearkened not to them, as Jehovah had said.

The Plague of Blood

14 And Jehovah said to Moses, Pharaoh's heart is hardened: he refuseth to let the people go. 15 Go unto Pharaoh in the morning—behold, he will go out unto the water—and take thy stand by the bank of the river in front of him; and take in thy hand the staff that was turned into a serpent. 16 And say unto him, Jehovah the God of the Hebrews has sent me to thee, saying, Let my people go, that they may serve me in the wilderness; but behold, hitherto thou hast not hearkened. 17 Thus saith Jehovah: In this shalt thou know that I am Jehovah—behold, I will smite with the staff that is in my hand upon the water which is in the river, and it shall be turned into blood. 18 And the fish that is in the river shall die; and the river shall stink; and the Egyptians shall loathe to drink the water out of the river. 19 And Jehovah said to Moses, Say unto Aaron, Take thy staff, and stretch out thy hand upon the waters of the Egyptians—upon their streams, upon their rivers, and upon their ponds, and upon all their reservoirs of water, that they may become blood; and there shall be blood throughout the land of Egypt, both in [vessels of] wood and in [vessels of] stone. 20 And Moses and Aaron did so, as Jehovah had commanded; and he lifted up the staff, and smote the waters that were in the river before the eyes of Pharaoh, and before the eyes of his bondmen; and all the waters that were in the river were turned into blood.

Matthew Henry's Commentary on Exodus 7:1-20

Commentary on Exodus 7:1-7

(Read Exodus 7:1-7)

God glorifies himself. He makes people know that he is Jehovah. Israel is made to know it by the performance of his promises to them, and the Egyptians by the pouring out of his wrath upon them. Moses, as the ambassador of Jehovah, speaking in his name, laid commands upon Pharaoh, denounced threatenings against him, and called for judgments upon him. Pharaoh, proud and great as he was, could not resist. Moses stood not in awe of Pharaoh, but made him tremble. This seems to be meant in the words, Thou shalt be a god unto Pharaoh. At length Moses is delivered from his fears. He makes no more objections, but, being strengthened in faith, goes about his work with courage, and proceeds in it with perseverance.

Commentary on Exodus 7:8-13

(Read Exodus 7:8-13)

What men dislike, because it opposes their pride and lusts, they will not be convinced of; but it is easy to cause them to believe things they wish to be true. God always sends with his word full proofs of its Divine authority; but when men are bent to disobey, and willing to object, he often permits a snare to be laid wherein they are entangled. The magicians were cheats, trying to copy the real miracles of Moses by secret sleights or jugglings, which to a small extent they succeeded in doing, so as to deceive the bystanders, but they were at length obliged to confess they could not any longer imitate the effects of Divine power. None assist more in the destruction of sinners, than such as resist the truth by amusing men with a counterfeit resemblance of it. Satan is most to be dreaded when transformed into an angel of light.

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.