'Speak In Tongues' in the Bible

Now I want you all to speak in tongues, but more that ye may prophesy. For greater is he who prophesies than he who speaks in tongues, unless he interprets, so that the congregation may receive edification.

I thank my God that I speak in tongues more than all of you.

If therefore the whole congregation comes together in the same place, and all speak in tongues, and unlearned or unbelieving men come in, will they not say that ye are mad?

Therefore brothers, be zealous for prophesying, and do not forbid to speak in tongues.