Adam Clarke on Acts 20:16

To sail by Ephesus - Not to touch there at this time.

To be at Jerusalem the day of pentecost - That he might have the opportunity of preaching the kingdom of God to multitudes of Jews from different places, who would come up to Jerusalem at that feast; and then he no doubt expected to see there a renewal of that day of pentecost in which the Spirit was poured out on the disciples, and in consequence of which so many were converted to God.