(9) Whom shall he teach knowledge?--The two verses that follow reproduce the language of the drunkards as they talk scornfully of the prophet. "To whom does he come with what he calls his 'knowledge' and his 'doctrine?' (better, message, as in Isaiah 28:19). Does he think that they are boys just weaned, who are to be taught the first elements of the religion of the infant school?" Then in their mockery they describe (Isaiah 28:10) his teaching, with what was to them its wearisome iteration, "Always precept upon precept, line upon line . . ."--petty rebukes and puerile harping upon the same note, semper eandem canens cantilenam. We can scarcely doubt that Isaiah was indignantly reproducing, as St. Paul does in 2Corinthians 10:10; 2Corinthians 11:16-17; the very words, almost the drunken accents, in which the priests and false prophets had spoken of him.

Verse 9. - Whom shall he teach? A sudden and abrupt transition. The best explanation seems to be that suggested by Jerome, and followed by Bishop Lowth and most commentators, viz. that the prophet dramatically introduces his adversaries as replying to him with taunting speeches. "Whom does he think he is teaching?" they ask. "Mere children, just weaned from their mother's milk, and taken away from the breast? Does he forget that we are grown men - nay, priests and prophets? And what poor teaching it is! What 'endless petty feazing'! (Delitzsch) - precept upon precept," etc. The intention is to throw ridicule upon the smallness and vexatious character of the prophet's interminable and uninterrupted chidings (Delitzsch). Knowledge... doctrine. Technical terms in Isaiah's teaching, which his adversaries seem to have ridiculed as "catch-words." The term translated "doctrine" means properly "tidings," and involves the idea that the prophet obtained the teaching so designated by direct revelation from God.

28:5-15 The prophet next turns to Judah, whom he calls the residue of his people. Happy are those alone, who glory in the Lord of hosts himself. Hence his people get wisdom and strength for every service and every conflict. But it is only in Christ Jesus that the holy God communicates with sinful man. And whether those that teach are drunk with wine, or intoxicated with false doctrines and notions concerning the kingdom and salvation of the Messiah, they not only err themselves, but lead multitudes astray. All places where such persons have taught are filled with errors. For our instruction in the things of God, it is needful that the same precept and the same line should be often repeated to us, that we may the better understand them. God, by his word, calls us to what is really for our advantage; the service of God is the only true rest for those weary of the service of sin, and there is no refreshment but under the easy yoke of the Lord Jesus. All this had little effect upon the people. Those who will not understand what is plain, but scorn and despise it as mean and trifling, are justly punished. If we are at peace with God, we have, in effect, made a covenant with death; whenever it comes, it cannot do us any real damage, if we are Christ's. But to think of making death our friend, while by sin we are making God our enemy, is absurd. And do not they make lies their refuge who trust in their own righteousness, or to a death-bed repentance? which is a resolution to sin no more, when it is no longer in their power to do so.Whom shall he teach knowledge?.... Not the drunken priest or prophet, who were both unfit for teaching men knowledge; but either the true and godly priest or prophet of the Lord, or the Lord himself, before spoken of as a spirit of judgment, Isaiah 28:6 namely, by his prophets and ministers, the latter seem rather intended; whom may or can such an one teach the knowledge of God, and of themselves; the knowledge of the law, and of the Gospel; the knowledge of divine truths, of things necessary to salvation, and the conduct of human life; of Jesus Christ, and the way of salvation by him, and of him, as a foundation of the Lord's laying in Zion, hereafter mentioned in this chapter? who are capable of receiving such instructions? it intimates the stupidity and sottishness of the Jews, whose minds were so impaired by excessive drinking, that they were not able to take in the knowledge of these things:

and whom shall he make to understand doctrine? or "hearing"; the hearing of the word, or the word heard, the report of the Gospel; so the word is used in Isaiah 53:1 this will never be understood, believed, and received, unless the arm of the Lord is revealed, or his power be exerted; prophets and ministers may speak to the ears of men, but they cannot give them an understanding of divine things, God only can do that: here it designs, as before, the unteachableness of the people of the Jews, being in the circumstances they were, as appears by what follows:

them that are weaned from the milk, and drawn from the breasts; signifying, that one might as well take children from the breast, such as are just weaned, and instruct them, as to pretend to teach these people the knowledge of divine things, or cause them to understand sound doctrine, that which is agreeable to law and Gospel; so sottish were they become through excessive drinking. Some understand this as a serious answer to the questions, and of persons in a metaphorical sense, who desire and thirst after the sincere milk of the word, as children just taken from the breast, and deprived of it, do; and who are afflicted and distressed, and without the milk of divine comfort, and are like weaned children, humble, meek, and lowly; see Matthew 11:25. Jarchi makes mention of such an interpretation as this, "them that are weaned from the milk"; from the law, which is called milk: "and drawn from the breasts"; drawn from the disciples of the wise men. It may be understood of such who departed from the sincere milk of the word; and embraced the traditions of the elders.