Here, I. God sends Moses the second time to Pharaoh (Exo 6:11) upon the same errand as before, to command him, at his peril, that he let the children of Israel go. Note, God repeats his precepts before he begins his punishments. Those that have often been called in vain to leave their sins must yet be called again and again, whether they will hear or whether they will forbear, Eze 3:11. God is said to hew sinners by his prophets (Hos 6:5), which denotes the repetition of the strokes. How often would I have gathered you?

II.Moses makes objections, as one discouraged, and willing to give up the cause, Exo 6:12. He pleads, 1. The unlikelihood of Pharaoh's hearing: "Behold the children of Israel have not hearkened unto me; they give no heed, no credit, to what I have said; how then can I expect that Pharaoh should hear me? If the anguish of their spirit makes them deaf to that which would compose and comfort them, much more will the anger of his spirit, his pride and insolence, make him deaf to that which will but exasperate and provoke him." If God's professing people hear not his messengers, how can it be thought that his professed enemy should? Note, The frowardness and untractableness of those that are called Christians greatly discourage ministers, and make them ready to despair of success in dealing with those that are atheistical and profane. We would be instrumental to unite Israelites, to refine and purify them, to comfort and pacify them; but, if they hearken not to us, how shall we prevail with those in whom we cannot pretend to such an interest? But with God all things are possible. 2. He pleads the unreadiness and infirmity of his own speaking: I am of uncircumcised lips; it is repeated, Exo 6:30. He was conscious to himself that he had not the gift of utterance, had no command of language; his talent did not lie that way. To this objection God had given a sufficient answer before, and therefore he ought not to have insisted upon it, for the sufficiency of grace can supply the defects of nature at any time. Note, Though our infirmities ought to humble us, yet they ought not to discourage us from doing our best in any service we have to do for God. His strength is made perfect in our weakness.

III.God again joins Aaron in commission with Moses, and puts an end to the dispute by interposing his own authority, and giving them both a solemn charge, upon their allegiance to their great Lord, to execute it with all possible expedition and fidelity. When Moses repeats his baffled arguments, he shall be argued with no longer, but God gives him a charge, and Aaron with him, both to the children of Israel and to Pharaoh, Exo 6:13. Note, God's authority is sufficient to answer all objections, and binds us to obedience, without murmuring or disputing, Phi 2:14. Moses himself has need to be charged, and so has Timothy, Ti1 6:13; Ti2 4:1.

Uncircumcised lips? - The word ערל aral, which we translate uncircumcised, seems to signify any thing exuberant or superfluous. Had not Moses been remarkable for his excellent beauty, I should have thought the passage might be rendered protuberant lips; but as this sense cannot be admitted for the above reason, the word must refer to some natural impediment in his speech; and probably means a want of distinct and ready utterance, either occasioned by some defect in the organs of speech, or impaired knowledge of the Egyptian language after an absence of forty years. See Clarke's note on Exo 4:10.

And the Lord spake unto Moses and unto Aaron,.... No notice is taken of the objection of Moses, having been sufficiently answered before, and Aaron is joined with him in the following charge:

and gave them a charge unto the children of Israel, and unto Pharaoh king of Egypt; that is, to go to the children of Israel and comfort them, and direct them what they should do, and how they should behave under their present circumstances; assuring them of deliverance, and to go to Pharaoh, and to make a fresh demand upon him to let Israel go; and in this work they had a solemn charge from God to continue, and not to desist from it, until they had finished it:

to bring the children of Israel out of the land of Egypt; which they were to be the instruments of: and that it might be known clearly from whom they descended, who had such a charge given them, and such honour put upon them, the following genealogy is recorded.

how then shall . . . who am of uncircumcised lips?--A metaphorical expression among the Hebrews, who, taught to look on the circumcision of any part as denoting perfection, signified its deficiency or unsuitableness by uncircumcision. The words here express how painfully Moses felt his want of utterance or persuasive oratory. He seems to have fallen into the same deep despondency as his brethren, and to be shrinking with nervous timidity from a difficult, if not desperate, cause. If he had succeeded so ill with the people, whose dearest interests were all involved, what better hope could he entertain of his making more impression on the heart of a king elated with pride and strong in the possession of absolute power? How strikingly was the indulgent forbearance of God displayed towards His people amid all their backwardness to hail His announcement of approaching deliverance! No perverse complaints or careless indifference on their part retarded the development of His gracious purposes. On the contrary, here, as generally, the course of His providence is slow in the infliction of judgments, while it moves more quickly, as it were, when misery is to be relieved or benefits conferred.