γενομένης δὲ τῆς φωνῆς ταύτης συνῆλθεν τὸ πλῆθος καὶ συνεχύθη ὅτι ἤκουον εἷς ἕκαστος τῇ ἰδίᾳ διαλέκτῳ λαλούντων αὐτῶν
What does τῆς φωνῆς ταύτης refer to?
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While the phrase "this sound" could refer to either the sound of the wind (vs. 2) or the speaking in tongues (vs. 4), several facts point to "this sound" being the speaking in tongues.
2:4 All of them were filled with the Holy Spirit, and they began to speak in other languages as the Spirit enabled them. [NET Bible]
2:2 Suddenly a sound (ἦχος) like a violent wind blowing came from heaven and filled the entire house where they were sitting. [NET]
2:6 When this sound occurred, a crowd gathered and was in confusion, because each one heard them speaking in his own language. 2:7 Completely baffled, they said, “Aren’t all these who are speaking Galileans? 2:8 And how is it that each one of us hears in our own native language?..." [NET, emphasis added]