'Speaks in a 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.

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

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.