I Corinthians 14:21

In the law--as the whole Old Testament is called, being all of it the law of God. Compare the citation of the Psalms as the "law," Joh 10:34. Here the quotation is from Isa 28:11-12, where God virtually says of Israel, This people hear Me not, though I speak to. them in the language with which they are familiar; I will therefore speak to them in other tongues, namely, those of the foes whom I will send against them; but even then they will not hearken to Me; which Paul thus applies, Ye see that it is a penalty to be associated with men of a strange tongue, yet ye impose this on the Church [GROTIUS]; they who speak in foreign tongues are like "children" just "weaned from the milk" (Isa 28:9), "with stammering lips" speaking unintelligibly to the hearers, appearing ridiculous (Isa 28:14), or as babbling drunkards (Act 2:13), or madmen (Co1 14:23).

In this passage the apostle pursues the argument, and reasons from other topics; as, I. Tongues, as the Corinthians used them, were rather a token of judgment from God than mercy to any people (Co1 14:21): In the law (that is, the Old Testament) it is written, With men of other tongues and other lips will I speak to this people; and yet for all this they will not hear me, saith the Lord, Isa 28:11. Compare Deu 28:46, Deu 28:49. To both these passages, it is thought, the apostle refers. Both are delivered by way of threatening, and one is supposed to interpret the other. The meaning in this view is that it is an evidence that a people are abandoned of God when he gives them up to this sort of instruction, to the discipline of those who speak in another language. And surely the apostle's discourse implies, "You should not be fond of the tokens of divine displeasure. God can have no gracious regards to those who are left merely to this sort of instruction, and taught in language which they cannot understand. They can never be benefited by such teaching as this; and, when they are left to it, it is a sad sign that God gives them over as past cure." And should Christians covet to be in such a state, or to bring the churches into it? Yet thus did the Corinthian preachers in effect, who would always deliver their inspirations in an unknown tongue. II. Tongues were rather a sign to unbelievers than to believers, Co1 14:22. They were a spiritual gift, intended for the conviction and conversion of infidels, that they might be brought into the Christian church; but converts were to be built up in Christianity by profitable instructions in their own language. The gift of tongues was necessary to spread Christianity, and gather churches; it was proper and intended to convince unbeli…

14:21-25 Paul used this quotation from Isa 28:11-12 to show that speaking in tongues is a sign, not for believers, but for unbelievers. However, in 1 Cor 14:23-25, Paul argues that even unbelievers are more likely to be convicted by a word of prophecy than by speaking in tongues. His point is that, in public worship, the gift of prophecy is of greater usefulness than the gift of tongues.