Behold, he smote the rock ... - See the notes at Psalm 78:15. The smiting of the rock the first time occurred "before" the complaining about the food. The fact that the rock had been smitten could not be doubted. They had thus had abundant evidence that God was able to do that, and to furnish "water" for them in the desert. It was unreasonable, therefore, to doubt whether he could provide "food" for them - for this in itself was no more difficult than to furnish water. Yet they are represented as affirming that this was far more difficult, and that, although it was admitted that God had provided "water," yet that to provide "food" was wholly beyond his power. Their special sin, therefore, was, that they doubted the power of God in one case, when, in another, equally difficult, they had had abundant proof of it. The spirit of complaining had not been put down by one surprising and undoubted miracle performed in their behalf - a miracle which proved that God had all the power necessary to meet their needs.

Can he give bread also? - Does the ability to cause water to flow from a rock prove that there is also ability to produce bread when necessary? They doubted it, and thus complained against God.

Can he provide flesh for his people? - They supposed that this required greater power than the providing of water, or even of bread, and that if it were admitted that God could furnish the two former, it would by no means follow that he could provide the latter. It was this, as the next verse shows, which was the immediate occasion of the special anger of the Lord.

Behold, he smote the rock, that the waters gushed out, and the streams overflowed,.... This they allow was done by him, for these are their words continued; suggesting, that though the waters did gush out upon smiting the rock, yet they might have been in the caverns of it before, and had remained there a long time, and might have come out of themselves; and therefore this was no such great matter, and might easily be accounted for:

but can he give bread also? solid, substantial bread, and not like this light bread, the manna, as they called it, Numbers 21:5, can he give us bread of corn, in a wilderness which is not a place of seed, where no corn grows? can he do this? this would show his power indeed:

can he provide flesh for his people? for so great a multitude, and in a place where no cattle are? let him do this, and we will believe his power; or else the words intimate that the smiting of the rock, and the waters flowing in such large streams, were an instance of his power, and therefore he that could do the one could do the other; he that could bring such large quantities of water out of a rock could give them solid bread and suitable flesh, and fulness of both; and should he not do so, they must conclude that he bore no good will to them, and had no love and kindness for them.

Behold, he smote the rock, that the waters gushed out, and the streams overflowed; can he give bread also? can he provide flesh for his people?

78:9-39. Sin dispirits men, and takes away the heart. Forgetfulness of God's works is the cause of disobedience to his laws. This narrative relates a struggle between God's goodness and man's badness. The Lord hears all our murmurings and distrusts, and is much displeased. Those that will not believe the power of God's mercy, shall feel the fire of his indignation. Those cannot be said to trust in God's salvation as their happiness at last, who can not trust his providence in the way to it. To all that by faith and prayer, ask, seek, and knock, these doors of heaven shall at any time be opened; and our distrust of God is a great aggravation of our sins. He expressed his resentment of their provocation; not in denying what they sinfully lusted after, but in granting it to them. Lust is contented with nothing. Those that indulge their lust, will never be estranged from it. Those hearts are hard indeed, that will neither be melted by the mercies of the Lord, nor broken by his judgments. Those that sin still, must expect to be in trouble still. And the reason why we live with so little comfort, and to so little purpose, is, because we do not live by faith. Under these rebukes they professed repentance, but they were not sincere, for they were not constant. In Israel's history we have a picture of our own hearts and lives. God's patience, and warnings, and mercies, imbolden them to harden their hearts against his word. And the history of kingdoms is much the same. Judgments and mercies have been little attended to, until the measure of their sins has been full. And higher advantages have not kept churches from declining from the commandments of God. Even true believers recollect, that for many a year they abused the kindness of Providence. When they come to heaven, how will they admire the Lord's patience and mercy in bringing them to his kingdom!