Berean Standard Bible
1 Corinthians 14:22
“Tongues, then, are a sign, not for believers, but for unbelievers. Prophecy, however, is for believers, not for unbelievers.”

In context
20Brothers, stop thinking like children. In regard to evil be infants, but in your thinking be mature.
22Tongues, then, are a sign, not for believers, but for unbelievers. Prophecy, however, is for believers, not for unbelievers.
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Berean Standard Bible · A modern, readable English translation. Public domain (CC0).