2. Korinther 8:18

the brother, whose praise is in the gospel--whose praise is known in connection with the Gospel: Luke may be meant; not that "the Gospel" here refers to his written Gospel; but the language implies some one well known throughout the churches, and at that time with Paul, as Luke then was (Act 20:6). Not a Macedonian, as appears from Co2 9:4. Of all Paul's "companions in travel" (Co2 8:19; Act 19:29), Luke was the most prominent, having been his companion in preaching the Gospel at his first entrance into Europe (Act 16:10). The fact that the person here referred to was "chosen of the churches" as their trustee to travel with Paul in conveying the contribution to Jerusalem, implies that he had resided among them some time before: this is true of Luke, who after parting from Paul at Philippi (as he marks by the change from "we" to "they," Act 16:11) six years before, is now again found in his company in Macedonia. In the interim he had probably become so well known that "his praise was throughout all the churches." Compare Co2 12:18; Plm 1:24. He who is faithful in the Gospel will be faithful also in matters of inferior importance [BENGEL].

In this and the following chapter Paul is exhorting and directing the Corinthians about a particular work of charity - to relieve the necessities of the poor saints at Jerusalem and in Judea, according to the good example of the churches in Macedonia, Rom 15:26. The Christians at Jerusalem, through war, famine, and persecution, had become poor, many of them had fallen into decay, and perhaps most of them were but poor when they first embraced Christianity; for Christ said, "The poor receive the gospel." Now Paul, though he was the apostle of the Gentiles, had a fonder regard, and kind concern, for those among the Jews who were converted to the Christian faith; and, though many of them had not so much affection to the Gentile converts as they ought to have had, yet the apostle would have the Gentiles to be kind to them, and stirred them up to contribute liberally for their relief. Upon this subject he is very copious, and writes very affectingly. In this eighth chapter he acquaints the Corinthians with, and commends, the good example of the Macedonians in this work of charity, and that Titus was sent to Corinth to collect their bounty (Co2 8:1-6). He the proceeds to urge this duty with several cogent arguments (Co2 8:7-15), and commends the persons who were employed in this affair (Co2 8:16-24).

8:18-24 Two other Christian men would travel with Titus to Corinth in order to guard against any criticism over the handling of the relief funds that they collected (8:20-21). Titus and his companions would ensure that the money was properly handled. The identity of the two companions is unknown.