'Tongue' in the Bible

For the one who speaks in a tongue does not speak to people but to God, because no one understands, but by the Spirit he speaks mysteries.

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

And so you through the tongue, unless you produce a clear message, how will it be known what is spoken? For you will be speaking into the air.

Therefore the one who speaks in a tongue must pray that he may interpret.

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

but in the church I prefer to speak five words with my mind, in order that I may instruct other [people], than ten thousand words in a tongue.

{Therefore what should you do}, brothers? Whenever you come together, each one of you has a psalm, has a teaching, has a revelation, has a tongue, has an interpretation. All [things] must be [done] for edification.

If anyone speaks in a tongue, [it must be] on one occasion two or at most three, and {one after the other}, and one must interpret.