And they were all filled with the Holy Spirit, and began to speak with other tongues, as the Spirit gave them utterance.
All Commentaries on Acts 2:4 Go To Acts 2
Cyril of Jerusalem
AD 386
And they began to speak in various languages:
The Galilean Peter or Andrew spoke Persian or Median. John and the rest of the Apostles spoke every tongue to those of Gentile extraction; The Holy Spirit taught them many languages at once, languages which in all their life they never knew. This is in truth vast wisdom, this is power divine. What a contrast of their long ignorance in time past to their sudden, complete and varied and unaccustomed exercise of these languages!