It is written; Isaiah 28:11-12.

Other tongues; foreign languages. In this passage Jehovah threatens the men who treated with scorn the messages of their own prophets, who spoke to them in their own language, that he will speak to them by the lips of foreigners; namely, by giving them up to their dominion. The point on which the apostle insists is, that here foreign tongues are made a sign to unbelievers.

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Old Testament