'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 him, but in his spirit he speaks mysteries.

He who speaks in a tongue edifies himself, but he who prophesies edifies the church.

Therefore, he who speaks in a tongue should 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.