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Clarke’s Commentary on the Bible
Confess your faults one to another - This is a good general direction to Christians who endeavor to maintain among themselves the communion of saints. This social confession tends much to humble the soul, and to make it watchful. We naturally wish that our friends in general, and our religious friends in particular, should think well of us; and when we confess to them offenses which, without this confession, they could never have known, we feel humbled, are kept from self-applause, and induced to watch unto prayer, that we may not increase our offenses before God, or be obliged any more to undergo the painful humiliation of acknowledging our weakness, fickleness, or infidelity to our religious brethren.
It is not said, Confess your faults to the Elders that they may forgive them, or prescribe penance in order to forgive them. No; the members of the Church were to confess their faults to each other; therefore auricular confession to a priest, such as is prescribed by the Romish Church, has no foundation in this passage. Indeed, had it any foundation here it would prove more than they wish, for it would require the priest to confess his sins to the people, as well as the people to confess theirs to the priest.
And pray one for another - There is no instance in auricular confession where the penitent and the priest pray together for pardon; but here the people are commanded to pray for each other that they may be healed.