Let the prophets speak two or three, and let the other judge. Let the prophets - Those who have the gift of speaking to men to edification, and exhortation, and comfort; 1 Corinthians 14:3.
Two or three - As prophesying implied psalmody, teaching, and exhortation, Dr. Lightfoot thinks that the meaning of the place is this: Let one sing who has a psalm; let another teach who has a doctrine; and let a third exhort, or comfort, who has a gift of that kind.
And let the other judge - The other prophets, or qualified persons, judge of the propriety of what had been spoken; or let them discern, διακρινετωσαν, how the revelation under the new covenant confirmed and illustrated the revelation granted under the Old Testament. It appears to have been taken for granted, that a man might pretend to this spirit of prophecy who was not sent of God; and therefore it was the duty of the accredited teachers to examine whether what he spoke was according to truth, and the analogy of faith. For the spirits of the prophets are subject to the prophets; every man's gift was to be judged of by those whose age, experience, and wisdom, gave them a right to decide. Besides, though the person who did speak might do it from an impulse of God, yet, if he was not sufficiently known, his testimony ought to be received with caution; and therefore the aged prophets should judge of his gift, lest false doctrines should slide into the Church.
But all these provisions, as Schoettgen justly observes, were in imitation of the practice in the Jewish synagogues; for there it was customary for them to object, interrogate, judge, refute, etc.