1 Corinthians 14:23-30

If therefore the whole church be assembled together and all speak with tongues, and there come in men unlearned or unbelieving, will they not say that ye are mad? But if all prophesy, and there come in one unbelieving or unlearned, he is reproved by all, he is judged by all; the secrets of his heart are made manifest; and so he will fall down on his face and worship God, declaring that God is among you indeed. What is it then, brethren? When ye come together, each one hath a psalm, hath a teaching, hath a revelation, hath a tongue, hath an interpretation. Let all things be done unto edifying. 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: but if there be no interpreter, let him keep silence in the church; and let him speak to himself, and to God. And let the prophets speak by two or three, and let the others discern. But if a revelation be made to another sitting by, let the first keep silence.