For they had previously seen Trophimus the Ephesian with him in the city, and they assumed that Paul had brought him into the temple.
We have here Paul brought into a captivity which we are not likely to see the end of; for after this he is either hurried from one bar to another, or lies neglected, first in one prison and then in another, and can neither be tried nor bailed. When we see the beginning of a trouble, we know not either how long it will last or how it will issue.
Commenting on Acts 21:27-40
For they had seen before with him in the city,.... Not of Ephesus, but of Jerusalem: Trophimus an Ephesian; the same that is mentioned in Act 20:4 whom these Jews of Asia, and who very probably were inhabitants of Ephesus, knew very well to be a Gentile: whom they supposed Paul had brought into the temple; for seeing him walk with the apostle very familiarly...
Verse 29. In the city. In Jerusalem. As he was with Paul, it was inferred that he would attend him everywhere. Trophimus. He had accompanied Paul on his way from Ephesus, . Whom they supposed, etc. This is a most striking illustration of the manner in which accusations are often brought against others.