'Speaks in a Tongue' in the Bible

For one who speaks in a tongue does not speak to men but to God; for no one understands, but in his spirit he speaks mysteries.

One who speaks in a tongue edifies himself; but one who prophesies edifies the church.

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

If anyone speaks in a tongue, it should be by two or at the most three, and each in turn, and one must interpret;