1 Corinthians 14:20-25 New King James Version (NKJV)
Tongues a Sign to Unbelievers
20 Brethren, do not be children in understanding; however, in malice be babes, but in understanding be mature.
21 In the law it is written:
“With men of other tongues and other lips
says the Lord.
22 Therefore tongues are for a sign, not to those who believe but to unbelievers; but prophesying is not for unbelievers but for those who believe. 23 Therefore if the whole church comes together in one place, and all speak with tongues, and there come in those who are uninformed or unbelievers, will they not say that you are [a]out of your mind? 24 But if all prophesy, and an unbeliever or an uninformed person comes in, he is convinced by all, he is convicted by all. 25 [b]And thus the secrets of his heart are revealed; and so, falling down on his face, he will worship God and report that God is truly among you.
1 Corinthians 14:20-25 New International Version (NIV)
20 Brothers and sisters, stop thinking like children. In regard to evil be infants, but in your thinking be adults. 21 In the Law it is written:
“With other tongues
22 Tongues, then, are a sign, not for believers but for unbelievers; prophecy, however, is not for unbelievers but for believers. 23 So if the whole church comes together and everyone speaks in tongues, and inquirers or unbelievers come in, will they not say that you are out of your mind? 24 But if an unbeliever or an inquirer comes in while everyone is prophesying, they are convicted of sin and are brought under judgment by all, 25 as the secrets of their hearts are laid bare. So they will fall down and worship God, exclaiming, “God is really among you!”