Certain of the chief of Asia - τῶν Ἀσιαρχῶν tōn Asiarchōn. Of the Asiarchs. These were persons who presided over sacred things and over the public games. It was their business to see that the proper services of religion were observed, and that proper honor was rendered to the Roman emperor in the public festivals, at the games, etc. They were annually elected, and their election was confirmed at Rome before it was valid They held a common council at the principal city within their province, as at Ephesus, Smyrna, Sardis, etc., to consult and deliberate about the interests committed to their charge in their various provinces (Kuinoel and Schleusner). Probably they were assembled on such an occasion now; and during their remaining there they had heard Paul preach, and were friendly to his views and doctrines.
Which were his friends - It does not appear from ibis that they were Christian converts; but they probably had feelings of respect toward him, and were disposed to defend him and his cause. Perhaps, also, there might have existed a personal acquaintance and attachment.
Would not adventure - Would not risk his life in the tumult, and under the excited feelings of the multitude.

Certain of the chief of Asia - Τινες των Ασιαρχων; Some of the Asiarchs. The Asiarchs were those to whom the care and regulation of the public games were intrusted: they were a sort of high priests, and were always persons of considerable riches and influence. These could not have been Christians; but they were what the sacred text states them to have been, αυτῳ φιλοι, his friends; and foreseeing that Paul would be exposed to great danger if he went into the theater, amidst such a tumultuous assembly, they sent a message to him, entreating him not to go into danger so apparent. Query: Did he not go, and fight with these wild beasts at Ephesus? 1-Corinthians 15:32.

(8) And certain of the chief of Asia, which were his friends, sent unto him, desiring [him] that he would not adventure himself into the theatre.
(8) There ought to be in all Christians, and especially in the ministers, an invincible steadfastness which may not by any storms or assaults be overcome, which nonetheless must modestly allow itself to be governed by wisdom.

And certain of the chief of Asia,.... Or the Asiarchs; these were not princes of Asia, rulers or governors of provinces, or cities, or civil magistrates; but priests who presided over the games and diversions at the theatre, and had the management and command of things there. Such an one was Philip the Asiarch, the church of Smyrna makes mention of in their account of the sufferings and martyrdom of Polycarp (z), whom the people entreated that he would send out the lion to Polycarp; that is, out of the theatre which he had the command of; but he replied he could not do it, because he had finished the theatrical exercises: from whence it appears that he was the governor of the theatre, and had his title of Asiarch from thence, as these men had, wherefore this word should not be rendered, the "princes of Asia", as by the Vulgate Latin; nor the "chief of Asia", as by the Syriac and Arabic versions, and by ours, but rather the "Asian priests". The Ethiopic version not knowing who should be meant by them, only reads, "and some of Asia".
Which were his friends; they had a good opinion of the apostle, and a good liking of his doctrines, and wished well to his person, and were concerned for his safety; though they might not have been really converted, and truly disciples, as those in the preceding verse; for otherwise one would think they would have relinquished their office and place. These
sent unto him, messengers or letters,
desiring him that he would not adventure himself into the theatre; they observed to him the danger he would expose himself to, and entreated he would show a greater regard to his life than to risk it in such a manner, a life might be so useful to many; and though they were the governors at the theatre, yet such was the rage and fury of the mob, that it was not in their power to restrain them from doing mischief, till such time as they were appeased.
(z) Apud Euseb. Eccl, Hist. l. 4. c. 15.

And certain of the chief of Asia--literally, "And certain also of the Asiarchs." These were wealthy and distinguished citizens of the principal towns of the Asian province, chosen annually, and ten of whom were selected by the proconsul to preside over the games celebrated in the month of May (the same month which Romanism dedicates to the Virgin). It was an office of the highest honor and greatly coveted. Certain of these, it seems, were favorably inclined to the Gospel, at least were Paul's "friends," and knowing the passions of a mob, excited during the festivals, "sent (a message) to him desiring him not to adventure himself into the theater."

The principal officers of Asia - The Asian priests, who presided over the public games, which they were then celebrating in honour of Diana.