Charles Ellicott Commentary Acts 2:1

"And when the day of Pentecost was now come, they were all together in one place." — Acts 2:1 (ASV)

Of all the feasts of the Jewish year, Pentecost was the one that attracted the largest number of pilgrims from distant lands. The dangers of travel by sea or land in the early spring or late autumn prevented their coming in any large numbers to the Passover or the Feast of Tabernacles. At no other feast would there have been representatives of so many nations. So, it may be noted, it was the Feast of Pentecost that St. Paul went up to keep repeatedly during his mission work in Greece and Asia. (See Notes on Acts 18:21; Acts 20:16.) Therefore, at no other time was the gift of the Spirit as likely to produce such direct and immediate results.