14:22a Tongues, then, are a sign, not for believers, but for unbelievers.

So unknown tongues are a sign for unbelievers. They are not a sign for believers.
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So when someone speaks in unknown/miraculous languages, it serves as a sign to unbelievers rather than to believers.

14:22b Prophecy, however, is for believers, not for unbelievers.

But prophecy is ⌊a sign⌋ for believers rather than unbelievers.
-or-
But when someone declares God’s word, believers receive ⌊a sign⌋. Unbelievers do not.

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