Which have borne witness of thy charity before the church - It would seem that they had returned to John, and borne honorable testimony to the love manifested to them by Gaius. Before what church they had borne this testimony is unknown. Perhaps it was the church in Ephesus.
Whom if thou bring forward on their journey - οὕς προπέμψας hous propempsas. "Whom bringing forward, or having brought forward." The word refers to aid rendered to them in their journey, in facilitating their travels, either by personally accompanying them, by furnishing them the means of prosecuting their journey, or by hospitably entertaining them. Gaius probably aided them in every way in which it was practicable. It has been made a question whether this refer, to the fact that he had thus aided them in some visit which they had made to the church where Gaius was, or to a visit which they purposed to make. The Greek would seem to favor the latter construction, and yet it would appear from the Epistle, that the "brethren and strangers" actually had been with him that they had been rejected by the church through the influence of Diotrephes, and had been thrown upon the hospitality of Gaius, and that they had returned, and had borne honorable testimony to his hospitality. These views can be reconciled by supposing, as Lucke does, that having been once on their travels, and having shared the hospitality of Gaius, they were purposing to visit that region again, and that John, praising him for his former hospitality, commends them again to him, stating the reason 3-John 1:9-10 why he did not, in accordance with the usual custom, recommend them to the care of the church. They had now gone out 3-John 1:7 on the same errand upon which they had formerly gone, and they had now equal claims to the hospitality of the friends of religion.
After a godly sort - Margin, as in Greek, "worthy of God." The meaning is, As becomes those who serve God; or as becomes those who are professors of his religion.
Thou shalt do well - You will do what religion requires in these circumstances.

Which have borne witness of thy charity - Of thy love and benevolence.
Before the Church - The believers at Ephesus; for to this Church the apostle seems to refer.
Whom if thou bring forward - If thou continue to assist such, as thou hast done, thou shalt do well.
The brethren of whom St. John speaks might have been apostles; the strangers, assistants to these apostles, as John Mark was to Barnabas. Both were itinerant evangelists.
After a godly sort - Αξιως του Θεου· Worthy of God; and in such a way as he can approve. Let all Churches, all congregations of Christians, from whom their ministers and preachers can claim nothing by law, and for whom the state makes no provision, lay this to heart; let them ask themselves, Do we deal with these in a manner worthy of God, and worthy of the profession we make? Do we suffer them to lack the bread that perisheth, while they minister to us with no sparing hand the bread of life? Let a certain class of religious people, who will find themselves out when they read this note, consider whether, when their preachers have ministered to them their certain or stated time, and are called to go and serve other Churches, they send them forth in a manner worthy of God, making a reasonable provision for the journey which they are obliged to take. In the itinerant ministry of the apostles it appears that each Church bore the expenses of the apostle to the next Church or district to which he was going to preach the word of life. So it should be still in the mission and itinerant ministry.

Which have borne witness of thy charity before the church: whom if thou (c) bring forward on their journey after a godly sort, thou shalt do well:
(c) He commends to Gaius, either those same men whom he had entertained before returning to him, about the affairs of the Church, or else some other who had similar business.

Which have borne witness of thy charity before the church,.... At Ephesus, where John was; these brethren and strangers coming thither, and being greatly affected with Gaius's kindness and liberality to them, could not forbear speaking of it to his praise, in the presence of the members of the church, as well as acquainted the Apostle John with it; the Syriac version reads, "before the whole church"; they bore testimony of his liberality in a very public manner And this the apostle mentions to encourage Gaius to go on, and continue in his kindness to the same persons, since they retained such a grateful sense of past favours; and whereas they were now returning back, he desires that he would give them some further assistance:
whom if thou bring forward on their journey; the word here used signifies, to send on before, as in Acts 15:3, and is used by the Septuagint in the same sense as here, and in the above places, in Genesis 18:16; where it is said, that "Abraham went with them (the angels) to bring them on in the way", "to send them on", or "send them away"; dismiss them, take his leave of them in a friendly and honourable way. The Targums of Onkelos and Jonathan render it, "to accompany them"; and so this Greek word, which seems to answer to the Hebrew phrase, signifies an honourable accompanying, leading forth, and taking leave of friends; and so the apostle encourages Gaius to behave in like manner to the brethren and strangers; meaning, either by accompanying them in person, or by sending his servants along with them, both to direct them the way, and to secure them from danger, and chiefly by furnishing them with everything necessary for them; see Titus 3:13. And this he would have him do,
after a godly sort; or "worthy of God"; in imitation of God, who is merciful, kind, and beneficent; or as it became him whom God had called by his grace to his kingdom and glory; or as it was fit and proper such servants of God, as those brethren were, should be used; and this would be doing well:
thou shalt do well; what is grateful and well pleasing to God, and beautiful and lovely in the eyes of his people.

borne witness of thy charity before the church--to stimulate others by the good example. The brethren so entertained by Gaius were missionary evangelists (3-John 1:7); and, probably, in the course of narrating their missionary labors for the edification of the Church where John then was, incidentally mentioned the loving hospitality shown them by Gaius.
bring forward on their journey--"If thou (continue to) forward on their journey" by giving them provisions for the way.
after a godly sort--Greek, "in a manner worthy of God," whose ambassadors they are, and whose servant thou art. He who honors God's missionary servants (3-John 1:7), honors God.

Who have testified of thy love before the church - The congregation with whom I now reside. Whom if thou send forward on their journey - Supplied with what is needful. Thou shalt do well - How tenderly does the apostle enjoin this!