1 Corinthians 14:20-22

MSB(i) 20 Brothers, stop thinking like children. In regard to evil be infants, but in your thinking be mature. 21 It is written in the Law: “By strange tongues and foreign lips I will speak to this people, but even then they will not listen to Me, says the Lord.” 22 Tongues, then, are a sign, not for believers, but for unbelievers. Prophecy, however, is for believers, not for unbelievers.