1 Corinthians 14:23 - 14:25
23 Therefore if the whole church assembles together and all speak in tongues, and uninformed men or unbelievers enter, will they not say that you are out of your mind? 24 But if all prophesy, and an unbeliever or an uninformed man enters, he is convicted by all, he is called to account by all; 25 the secrets of his heart are disclosed; and so he will fall on his face and worship God, declaring that surely God is among you.