1 Corinthians 14:27

let it be by two, or at the most by three Because the long utterance in an unknown tongue would weary the Church without a sufficient corresponding benefit.

and that by course Literally, and in turn.

and let one interpret Let there be one, and only one, interpreter of each speech; for if the second interpretation were the same as the first it were unnecessary; if different, it would be perplexing.