1 Corinthians 14
22 Ref Wherefore tongues are for a sign, not to them that believe, but to the unbelieving: but prophesying `is for a sign', not to the unbelieving, but to them that believe.
23 Ref 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?
24 Ref But if all prophesy, and there come in one unbelieving or unlearned, he is reproved by all, he is judged by all;
25 Ref 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.