John Chrysostom
What do these words mean? If, he says, while you are prophesying and speaking, the spirit of another stirs him, then you must be silent.
As before concerning tongues, so here also he requires this to be done in turn, but here in a higher way. He did not say, "in turn," but, "if a revelation is made to another sitting by."
Why should the first continue speaking when another is being stirred to prophesy? But should not both speak? That is unfitting and would produce disorder.
Should not the first speak? This also is unfitting, because the Spirit stirred the other while the first was speaking precisely so that he too might say something.
Then, to console the one whom he commands to be silent, he says: "For you can all prophesy one by one, that all may learn and all may be comforted."
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Do you see how he again gives the reason why he commands everything in this way?
If he completely forbids one who has the gift of tongues to speak when there is no interpreter, because the speech would be useless, then he rightly commands prophecy also to stop when it brings no benefit.
For then it can produce confusion, disturbance, and unseemly disorder.