Here, I. God encourages Moses to go to Pharaoh, and at last silences all his discouragements. 1. He clothes him with great power and authority (Exo 7:1): I have made thee a god to Pharaoh; that is, my representative in this affair, as magistrates are called gods, because they are God's viceregents. He was authorized to speak and act in God's name and stead, and, under the divine direction, was endued with a divine power to do that which is above the ordinary power of nature, and invested with a divine authority to demand obedience from a sovereign prince and punish disobedience. Moses was a god, but he was only a made god, not essentially one by nature; he was no god but by commission. He was a god, but he was a god only to Pharaoh; the living and true God is a God to all the world. It is an instance of God's condescension, and an evidence that his thoughts towards us are thoughts of peace, that when he treats with men he treats by men, whose terror shall not make us afraid. 2. He again nominates him an assistant, his brother Aaron, who was not a man of uncircumcised lips, but a notable spokesman: "He shall be thy prophet," that is, "he shall speak from thee to Pharaoh, as prophets do from God to the children of men. Thou shalt, as a god, inflict and remove the plagues, and Aaron, as a prophet, shall denounce them, and threaten Pharaoh with them." 3. He tells him the worst of it, that Pharaoh would not hearken to him, and yet the work should be done at last, Israel should be delivered and God therein would be glorified, Exo 7:4, Exo 7:5. The Egyptians, who would not know the Lord, should be made to know him. Note, It is, and ought to be, satisfaction enough to God's messengers that, whatever contradiction and opposition may be given them, thus far they shall gain their point, that God will be glorified in the success of their embassy, and all his chosen Israel will be saved, and then they have no reason to say that they have laboured in vain. See here, (1.) How 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 (Exo 6:3), and the Egyptians are made to know it by the pouring out of his wrath upon them. Thus God's name is exalted both in those that are saved and in those that perish. (2.) What method he takes to do this: he humbles the proud, and exalts the poor, Luk 1:51, Luk 1:52. If God stretch out his hand to sinners in vain, he will at last stretch out his hand upon them; and who can bear the weight of it?

II.Moses and Aaron apply themselves to their work without further objection: They did as the Lord commanded them, Exo 7:6. Their obedience, all things considered, was well worthy to be celebrated, as it is by the Psalmist (Psa 105:28), They rebelled not against his word, namely, Moses and Aaron, whom he mentions, v. 26. Thus Jonah, though at first he was very averse, at length went to Nineveh. Notice is taken of the age of Moses and Aaron when they undertook this glorious service. Aaron the elder (and yet the inferior in office) was eighty-three, Moses was eighty; both of them men of great gravity and experience, whose age was venerable, and whose years might teach wisdom, v. 7. Joseph, who was to be only a servant to Pharaoh, was preferred at thirty years old; but Moses, who was to be a god to Pharaoh, was not so dignified until he was eighty years old. It was fit that he should long wait for such an honour, and be long in preparing for such a service.

I will harden Pharaoh's heart - I will permit his stubbornness and obstinacy still to remain, that I may have the greater opportunity to multiply my wonders in the land, that the Egyptians may know that I only am Jehovah, the self-existent God. See Clarke's note on Exo 4:21.

But Pharaoh shall not hearken unto you,.... Regard not what they said, nor answer the demand they made, or obey the command of God delivered by them to him: this the Lord apprised them of, that they might not be discouraged, and conclude their labour would be in vain, their attempts fruitless, and they should never gain their point, but spend their time, and expose themselves to danger to no purpose:

that I may lay mine hand upon Egypt; the inhabitants of Egypt, smiting them with one plague after another, and particularly with the last, slaying their firstborn; every plague was a stroke of his hand, and an effect of his mighty power and vengeance, and more especially that:

and bring forth mine armies; the children of Israel consisting of 600,000 men, besides women and children, Exo 12:37 which, divided into twelve tribes, made twelve fine armies, 50,000 men in a tribe or army upon an average:

and my people the children of Israel out of the land of Egypt; the word "and" need not be supplied; if any supplement is necessary, the word "even" would be better, since this clause is added by way of explanation, showing who are meant by the armies of the Lord, his people to be brought out:

by great judgments; inflicted upon the Egyptians.

I may lay mine hand upon Egypt, &c.--The succession of terrible judgments with which the country was about to be scourged would fully demonstrate the supremacy of Israel's God.