NET
27 If someone speaks in a tongue, it should be two, or at the most three, one after the other, and someone must interpret.
Darby
27 If any one speak with a tongue, [let it be] two, or at the most three, and separately, and let one interpret;
KJV
27 If any man speak in an [unknown] tongue, [let it be] by two, or at the most [by] three, and [that] by course; and let one interpret.