John Chrysostom
"Let two or three prophets speak, and let the others discern" (1 Cor 14:29). He added nothing more of the sort that he said about tongues.
But what does he mean? Does he not show that prophecy too is insufficient by itself, if he leaves it to others to discern? No, it is quite sufficient.
For this reason he did not stop the mouth of the one prophesying, as he did with the one speaking in tongues when there is no interpreter.
Concerning the latter he said: "If there is no interpreter, let him keep silent." Concerning the former he did not say: if there is no one to discern, let him not prophesy.
He merely gave instruction to the hearer. He said this as a warning to the hearers, lest a diviner should occur among them.
He commanded them to beware of this at the beginning, when he showed the difference between divination and prophecy. Now again he commands them to distinguish and observe the same thing, so that nothing demonic may slip in.