BLB(i)
21 In the Law it has been written: “By other tongues, and by other lips, I will speak to this people, and not even thus will they hear Me, says the Lord.”
22 So then, tongues are for a sign, not to those believing, but to the unbelieving; but prophecy is not to the unbelieving, but to the believing.
23 Therefore if the whole church gathers together in one place and all should speak in tongues, but uninstructed ones or unbelievers come in, will not they say that you are mad?