1 Corinthians 14:21-23

Twentieth_Century(i) 21 It is said in the Law-'In strange tongues and by the lips of strangers will I speak to this people, but even then they will not listen to me, says the Lord.' 22 Therefore the gift of the 'tongues' is intended as a sign, not for those who believe in Christ, but for those who do not, while the gift of preaching is intended as a sign, not for those who do not believe in Christ, but for those who do. 23 So, when the whole Church meets, if all present use the gift of 'tongues,' and some men who are without the gift, or who are unbelievers, come in, will not they say that you are mad?