I Coríntios 14:2

2 For anyone who speaks in a tongue Or [in another language]; also in verses 4, 13, 14, 19, 26 and 27 does not speak to people but to God. Indeed, no one understands them; they utter mysteries by the Spirit.

2 For he who makes use of tongues is not talking to men but to God; because no one has the sense of what he is saying; but in the Spirit he is talking of secret things.