And how hear we every man in our own tongue, wherein we were born?
Note 10 at Ac 2:8: At least thirteen different foreign regions or groups of people were identified in this list. That would lead us to believe that more than just the apostles were speaking in tongues (see note 5 at Ac 2:4). Some have suggested that it was not the apostles who were speaking in tongues but the hearers who were hearing in their native tongues. That is definitely not what Luke portrayed in this account. "They [i.e., the disciples]...began to speak with other tongues, as the Spirit gave them utterance" (Ac 2:4, brackets mine).