1 Corinthians 14:21-23

Living Bible

²¹ We are told in the ancient Scriptures that God would send men from other lands to speak in foreign languages to his people, but even then they would not listen. ²² So you see that being able to “speak in tongues” is not a sign to God’s children concerning his power, but is a sign to the unsaved. However, prophecy (preaching the deep truths of God) is what the Christians need, and unbelievers aren’t yet ready for it. ²³ Even so, if an unsaved person, or someone who doesn’t have these gifts, comes to church and hears you all talking in other languages, he is likely to think you are crazy.