And the Lord said unto Moses. Moses now begins to relate the two plagues which were inflicted upon Egypt before Pharaoh was induced to obey; and although there was something prodigious in the madness which strove against God's hand so powerfully constraining him, yet in the person of this single reprobate, the picture of human pride and rebellion, when it is not controlled by a spirit of tractableness, is presented to our view. Let the faithful then be admonished by this narrative diligently to beware, lest, by wantonly rebelling against God, they provoke a similar vengeance upon themselves. For the same Being who hardened Pharaoh's heart is the constant avenger of impiety, and, smiting His enemies with a spirit of confusion, renders them as furious as they are senseless. Moreover, lest Moses, stumbling against this obstacle, should desist from the course he had begun, God encourages him to the combat, as much as to say, that he had to contend with a very hard stone until it should be broken. Hearing that Pharaoh's heart was hardened, he might begin to waver, unless a hope of victory were shewn him from elsewhere. But since the obstinacy of this beast is indomitable, God arms His servant with new weapons, as much as to say, that he must be worn down though he could not be broken. But although to some the analogy may appear far-fetched, between the ten plagues and the ten precepts of the law, yet, in my opinion, it is probable, and agreeable to reason, that before God promulgated the law the wicked were smitten with as many plagues as He was about to give precepts to His people, that in this way He might confirm their authority. First, however, He commands Moses to take up the rod, and reminds him of the recent miracle that he may gird himself to the new conflict with greater confidence. Then, after the Hebrew manner, He more fully lays open what He had briefly touched upon; for, at first, no mention is made of Aaron, but God only announces to Moses what He would have done; then He explains that the hand of Aaron was to be interposed. Where God reminds them that the rod was lately turned into a serpent, He shews that we profit but little by His works, unless our faith gathers strength from them. Besides, when God denounces to Pharaoh what He is going to do, He renders him more inexcusable, because he is not awakened by threats to repentance. God indeed knew that this would be without success; but although he knows the disease to be incurable, He still ceases not to apply the remedies -- not indeed such as will restore health, but such as will draw out the secret poison from the mind. Many are here at issue (litigant) with God, because He not only speaks to the deaf, but even, by admonishing or chastising them in vain, exasperates their malice more and more. But it is for us, when any appearance of unreasonableness perplexes us, reverently to adore the secret judgments of God and to be soberly wise. Meanwhile the event shews that God's threatenings do not fall ineffectually, but that the contempt of them doubles both the crime and the punishment.

Pharaoh's heart is hardened - כבד cabed, is become heavy or stupid; he receives no conviction, notwithstanding the clearness of the light which shines upon him. We well know the power of prejudice: where persons are determined to think and act after a predetermined plan, arguments, demonstrations, and even miracles themselves, are lost on them, as in the case of Pharaoh here, and that of the obstinate Jews in the days of our Lord and his apostles.

And the Lord said unto Moses, Pharaoh's heart is hardened,.... Or "heavy" (c), 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.
(c) "grave", Montanus, Drusius. So Ainsworth.

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, Zac 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.

Pharaoh's heart is hardened--Whatever might have been his first impressions, they were soon dispelled; and when he found his magicians making similar attempts, he concluded that Aaron's affair was a magical deception, the secret of which was not known to his wise men.

When Pharaoh hardened his heart against the first sign, notwithstanding the fact that it displayed the supremacy of the messengers of Jehovah over the might of the Egyptian conjurers and their gods, and refused to let the people of Israel go; Moses and Aaron were empowered by God to force the release of Israel from the obdurate king by a series of penal miracles. These מפתים were not purely supernatural wonders, or altogether unknown to the Egyptians, but were land-plagues with which Egypt was occasionally visited, and were raised into miraculous deeds of the Almighty God, by the fact that they burst upon the land one after another at an unusual time of the year, in unwonted force, and in close succession. These plagues were selected by God as miraculous signs, because He intended to prove thereby to the king and his servants, that He, Jehovah, was the Lord in the land, and ruled over the powers of nature with unrestricted freedom and omnipotence. For this reason God not only caused them to burst suddenly upon the land according to His word, and then as suddenly to disappear according to His omnipotent will, but caused them to be produced by Moses and Aaron and disappear again at their word and prayer, that Pharaoh might learn that these men were appointed by Him as His messengers, and were endowed by Him with divine power for the accomplishment of His will.