1 Corinthians 14:21-23

Christian Standard Bible Anglicised

²¹ It is written in the law,

says the Lord. ²² Speaking in tongues, then, is intended as a sign, not for believers but for unbelievers, while prophecy is not for unbelievers but for believers. ²³ If, therefore, the whole church assembles together and all are speaking in tongues and people who are outsiders or unbelievers come in, will they not say that you are out of your minds?