To whom ye forgive any thing - Here he farther shows them that his sole object in the punishment inflicted on the transgressor, was his amendment and therefore promises to ratify, in the name and authority of Christ, the free pardon which he exhorts them to dispense.
In the person of Christ - As I believe Christ acts towards his penitent soul, so do I. Christ forgives his sin, and takes him to his favor; let us forgive him his offense against the Church, and restore him to its communion.
To whom ye forgive anything - The sense here is, “I have confidence in you as a Christian society and such confidence, that if you forgive an offence in one of your members, I shall approve the act, and shall also be ready to forgive.” He refers, doubtless, to this particular case; but he makes his remark general. It is implied here, I think, that the Corinthians were disposed to forgive the offending brother; and Paul here assures them that they had his hearty assent to this, and that if they did forgive him, he was ready to join them in the act, and to forgive him also.
For if I forgave anything - If I forgive anything; if I remit any of the punishments which have been inflicted by my authority.
For your sakes - It is not on account of the offender alone; it is in order to promote the happiness and purity of the church.
In the person of Christ - Locke paraphrases this, “By the authority, and in the name of Christ.” Doddridge,” As in the person of Christ, and by the high authority with which he has been pleased to invest me.” Tyndale, “In the room of Christ.” The word rendered “person” (Margin, “sight,” πρόσωπον prosōponfrom πρός prosand ὤψ ōps), means properly the part toward, at, and around the eye - Robinson. Then it means the face, visage, countenance; then the presence, person, etc. Here it probably means, in the presence of Christ; with his eye upon me, and conscious that I am acting before him, and must give account to him. It implies, undoubtedly, that Paul acted by his authority, and felt that he was doing that which Christ would approve.