1 Corinthians 14:25 (KJV)

Brethren, be not children in understanding: howbeit in malice be ye children, but in understanding be men.

In the law it is written, With men of other tongues and other lips will I speak unto this people; and yet for all that will they not hear me, saith the LORD.

Wherefore tongues are for a sign, not to them that believe, but to them that believe not: but prophesying serveth not for them that believe not, but for them which believe.

If therefore the whole church be come together into one place, and all speak with tongues, and there come in those that are unlearned, or unbelievers, will they not say that ye are mad?

But if all prophesy, and there come in one that believeth not, or one unlearned, he is convinced of all, he is judged of all:

How is it then, brethren? when ye come together, every one of you hath a psalm, hath a doctrine, hath a tongue, hath a revelation, hath an interpretation. Let all things be done unto edifying.

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.

But if there be no interpreter, let him keep silence in the church; and let him speak to himself, and to God.

Let the prophets speak two or three, and let the other judge.

If any thing be revealed to another that sitteth by, let the first hold his peace.