1 Corinthians 14:24 KJV

22Wherefore 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.

23If 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?

24But if all prophesy, and there come in one that believeth not, or one unlearned, he is convinced of all, he is judged of all:

25And thus are the secrets of his heart made manifest; and so falling down on his face he will worship God, and report that God is in you of a truth.

26How 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.