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