Commentaries
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.
5-11. there were dwelling at Jerusalem Jews, devout men out of every nation—not, it would seem, permanently settled there (see Ac 2:9), though the language seems to imply more than a temporary visit to keep this one feast.