1 Corinthians 14:22-24

New Century Version

²² So the gift of speaking in different kinds of languages is a sign for those who do not believe, not for those who do believe. And prophecy is for people who believe, not for those who do not believe. ²³ Suppose the whole church meets together and everyone speaks in different languages. If some people come in who do not understand or do not believe, they will say you are crazy. ²⁴ But suppose everyone is prophesying and some people come in who do not believe or do not understand. If everyone is prophesying, their sin will be shown to them, and they will be judged by all that they hear.