5 Now there were living at Jerusalem, Jews, God-fearing men, from every nation under heaven. 6 And when this sound came to their ears, they all came together, and were greatly surprised because every man was hearing the words of the disciples in his special language. 7 And they were full of wonder and said, Are not all these men Galilaeans? 8 And how is it that every one of us is hearing their words in the language which was ours from our birth? 9 Men of Parthia, Media, and Elam, and those living in Mesopotamia, in Judaea and Cappadocia, in Pontus and Asia, 10 In Phrygia and Pamphylia, in Egypt and the parts of Libya about Cyrene, and those who have come from Rome, Jews by birth and others who have become Jews, 11 Men of Crete and Arabia, to all of us they are talking in our different languages, of the great works of God. 12 And they were all surprised and in doubt saying to one another, What is the reason of this?
Matthew Henry's Commentary on Acts 2:5-12
Commentary on Acts 2:5-13
(Read Acts 2:5-13)
The difference in languages which arose at Babel, has much hindered the spread of knowledge and religion. The instruments whom the Lord first employed in spreading the Christian religion, could have made no progress without this gift, which proved that their authority was from God.