'Tongue' in the Bible

For the one speaking in a tongue does not speak to people but to God, for no one understands; he is speaking mysteries by the Spirit.

The one who speaks in a tongue builds himself up, but the one who prophesies builds up the church.

It is the same for you. If you do not speak clearly with your tongue, how will anyone know what is being said? For you will be speaking into the air.

So then, one who speaks in a tongue should pray that he may interpret.

If I pray in a tongue, my spirit prays, but my mind is unproductive.

but in the church I want to speak five words with my mind to instruct others, rather than ten thousand words in a tongue.

What should you do then, brothers and sisters? When you come together, each one has a song, has a lesson, has a revelation, has a tongue, has an interpretation. Let all these things be done for the strengthening of the church.

If someone speaks in a tongue, it should be two, or at the most three, one after the other, and someone must interpret.