Council of Trent: Session XIV, On The Most Holy Sacrament Of Penance, Canon XV

ON THE MOST HOLY SACRAMENT OF PENANCE

CANON XV.--If any one saith, that the keys are given to the Church, only to loose, not also to bind; and that, therefore, priests act contrary to the purpose of the keys, and contrary to the institution of Christ, when they impose punishments on those who confess; and that it is a fiction, that, after the eternal punishment, has, by virtue of the keys, been removed, there remains for the most part a temporal punishment to be discharged; let him be anathema.

Translation: J. Waterworth, The Canons and Decrees of the Council of Trent (1848), Hanover Historical Texts Project transcription (1995).