1 Corinthians 14:22

It follows that speaking in other languages is intended as a sign, not for believers but for unbelievers. But prophecy is not for unbelievers but for believers.

Mark 16:17

And these signs will accompany those who believe: In My name they will drive out demons; they will speak in new languages;

1 Corinthians 14:1

Pursue love and desire spiritual gifts, and above all that you may prophesy.

Acts 2:6-12

When this sound occurred, a crowd came together and was confused because each one heard them speaking in his own language.

Acts 2:32-36

“God has resurrected this Jesus. We are all witnesses of this.

We know that the law is not meant for a righteous person, but for the lawless and rebellious, for the ungodly and sinful, for the unholy and irreverent, for those who kill their fathers and mothers, for murderers,

Treasury of Scripture Knowledge

Summary

1 Corinthians 14:22

Wherefore tongues are for a sign, not to them that believe, but to them that believe not: but prophesying serveth not for them that believe not, but for them which believe.