1 Corinthians 14:22-24

New International Version

²² Tongues, then, are a sign, not for believers but for unbelievers; prophecy,^(A) however, is not for unbelievers but for believers. ²³ So if the whole church comes together and everyone speaks in tongues, and inquirers or unbelievers come in, will they not say that you are out of your mind?^{(B) 24} But if an unbeliever or an inquirer comes in while everyone is prophesying, they are convicted of sin and are brought under judgment by all,