Charles Ellicott Commentary 1 Corinthians 14:27

"If any man speaketh in a tongue, [let it be] by two, or at the most three, and [that] in turn; and let one interpret:" — 1 Corinthians 14:27 (ASV)

If any man speak in an unknown tongue.—Better, If any man speak in a tongue. Here is the practical application of the general rule just laid down for the exercise of the gift of tongues. Those who had that gift were not all to speak together, and so cause confusion; only two, or at the most three, were to speak in each assembly, and each of such group was to speak in turn, one at a time. There was to be with each group one who had the gift of interpretation, and he was to interpret to the listeners.