Acts 2:4-11
They were all filled with the Holy Spirit, and began to speak in foreign languages according as the Spirit gave them words to utter.
1 Corinthians 14:2-11
For he who speaks in an unknown tongue is not speaking to men, but to God; for no one understands him. Yet in the Spirit he is speaking secret truths.
1 Corinthians 14:23
Accordingly if the whole Church has assembled and all are speaking in 'tongues,' and there come in ungifted men, or unbelievers, will they not say that you are all mad?
Treasury of Scripture Knowledge
Summary
Go to, let us go down, and there confound their language, that they may not understand one another's speech.
Confound
Bible References
Confound
Acts 2:4
They were all filled with the Holy Spirit, and began to speak in foreign languages according as the Spirit gave them words to utter.
May
1 Corinthians 14:2
For he who speaks in an unknown tongue is not speaking to men, but to God; for no one understands him. Yet in the Spirit he is speaking secret truths.