1 Corinthians 14:21-23

Noyes(i) 21 In the Law it is written: "With men of other tongues and with other lips will I speak to this people, 22 and yet for all that will they not hear me, saith the Lord." Wherefore the tongues are for a sign, not to believers, but to unbelievers; but prophesying is not for unbelievers, but for believers. 23 If therefore the whole church be assembled in one place, and all be speaking with tongues, and there come in those who are unlearned, or unbelievers, will they not say that ye are mad?