1 Korintus 14:18-19

14:18 I thank God that I speak in tongues more than all of you, 14:19 but in the church I want to speak five words with my mind to instruct others, rather than ten thousand words in a tongue.

1 Korintus 14:22

14:22 So then, tongues are a sign not for believers but for unbelievers. Prophecy, however, is not for unbelievers but for believers.