1 Corinthians 14:19-23

nevertheless, in church I prefer to speak five words with my mind so that I may instruct others also, rather than ten thousand words in a tongue. Instruction for the Church

Brothers and sisters, do not be children in your thinking; yet in evil be infants, but in your thinking be mature.

In the Law it is written: “By men of strange tongues and by the lips of strangers I will speak to this people, and even so they will not listen to Me,” says the Lord.

So then, tongues are for a sign, not to those who believe but to unbelievers; but prophecy is not for unbelievers, but for those who believe.

Therefore if the whole church gathers together and all the people speak in tongues, and outsiders or unbelievers enter, will they not say that you are insane?