Hilary of Poitiers

To hold out a great and terrible fear, by which all men should be reached in this present life, He pronounces that the judgment of the Apostles should be ratified, so that whosoever they bound on earth, i. e. left entangled in the noose of sin, and whosoever they loosed, i. e. accorded the pardon of God’s mercy to their salvation, that these should be bound and loosed in heaven.