Beloved, you are faithful in what you are doing for the brothers, and especially since they are strangers to you.
I. John receives a good report of Gaius's faith and charity from the brethren. Gaius’s love for the brethren and hospitality to strangers proves his sincerity in the faith. II. Gaius is commended for his hospitality, a virtue extended to strangers and those of different churches. III. John expresses great joy in hearing of Gaius's walk in truth.
Commenting on 3 John 1:3-8
Beloved, thou doest faithfully,.... Or a faithful thing, and as became a faithful man, a believer in Christ; in all his beneficence and charity he acted the upright part; he did not do it in an hypocritical way, to be seen of men, and gain applause from them, but from a principle of love, and with a view to the glory of God: whatsoever thou...
Verse 5. Beloved, thou doest faithfully. In the previous verses the writer had commended Gaius for his attachment to truth, and his general correctness in his Christian life. He now speaks more particularly of his acts of generous hospitality, and says that he had fully, in that respect, done his duty as a Christian. Whatsoever thou doest. In all your intercourse with them, and in all your conduct towards them.