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

ON THE MOST HOLY SACRAMENT OF PENANCE

CANON III.--If any one saith, that those words of the Lord the Saviour, Receive ye the Holy Ghost, whose sins you shall forgive, they are forgiven them, and whose sins you shall retain, they are retained, are not to be understood of the power of forgiving and of retaining sins in the Sacrament of penance, as the Catholic Church has always from the beginning understood them; but wrests them, contrary to the institution of this sacra ment, to the power of preaching the gospel; let him be anathema.

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