1 Corinthians 14:21-23

Holman Christian Standard Bible

²¹ It is written in the law:

says the Lord. ²² It follows that speaking in other languages is intended as a sign,^[b] not for believers but for unbelievers. But prophecy is not for unbelievers but for believers. ²³ Therefore, if the whole church assembles together and all are speaking in other languages and people who are uninformed or unbelievers come in, will they not say that you are out of your minds?