Tongues, then, are a sign, not for believers, but for unbelievers. Prophecy, however, is for believers, not for unbelievers.
Textus Receptus (TR) - 1 Corinthians 14:22 >Ὥστε αἱ γλῶσσαι εἰς σημεῖόν εἰσιν, οὐ τοῖς πιστεύουσιν, ἀλλὰ τοῖς ἀπίστοις· ἡ δὲ προφητεία, οὐ τοῖς ἀπίστοις, ἀλλὰ τοῖς πιστεύουσιν.