And they spake against God. The prophet had said that they tempted God in their heart; [1] and now he adds, that they were not ashamed openly to utter with their impure and blasphemous tongues, the impiety which they had inwardly conceived. From this, it is the more abundantly manifest that malignity and wickedness had taken entire possession of their hearts. Thus we see how lust conceives sin, when it is admitted into the soul with unhallowed consent. Afterwards the sin develops itself farther, even as we see the Israelites proceeding to such a length of profane wantonness, as to call in question the power of God, as if they made no account of it, any farther than as it ministered to their lust. By the table prepared which is spoken of, is to be understood the dainty food, which was their ordinary fare in Egypt. A single dish did not satisfy their appetite. They were not contented unless they could gratify themselves with great abundance and variety. When it is said in the following verse, Behold! God smote the rock, and the waters gushed out, etc., this, I have no doubt, is the language of bitter irony, with which the prophet taunts their unblushing insolence. It is not very likely that they spake in this manner; but he relates, as it were, with their mouth, or in their person, the things which took place before their eyes.

Footnotes

1 - "They tempted God with their heart,' that is, heartily, or with all their soul." -- Walford.

Yea, they spake against God - That is, in the manner which is immediately specified - by calling in question his power, or his ability to provide for them in the wilderness. See Numbers 11:4.
They said, Can God furnish a table in the wilderness? - In the desert. The word rendered "furnish" is in the margin "order." It means to arrange; to set in order; and here to arrange and provide for, as at a feast. The precise words used by the complaining Hebrews are not quoted here, but the substance of what they said is retained. The idea is, that what they spake was "equivalent" to saying that God could not prepare a table for them; that is, provide for them, in the desert.

Yea, they spake against God; they said, Can God (m) furnish a table in the wilderness?
(m) Thus when we give place to sin, we are moved to doubt God's power, unless he is always ready to serve our lust.

Yea, they spoke against God,.... Not only thought ill of him, and tempted him in their hearts, but they expressed with their mouths what was in their hearts, and spoke against him, his power, and his providence, in plain words, though he had been so good and gracious to them, and had done such wonderful things for them: they said,
can God furnish a table in the wilderness? these are the words which they spoke against him, and by which they tempted him, questioning his power and his goodness, and expressing their dissatisfaction with their present and daily allowance; they were not content with the manna they had every day, but they wanted to have a table ordered and spread with all kind of dainties. The sense of the question is, can the Lord do this for us? give us a plentiful table in the wilderness, as well as drop the manna about our tents? if he can, why does not he? if he does not, it must be either for want in himself, or want of good will to us; and thus tried and tempted the Lord.

in the face of His admitted power.