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

ON THE MOST HOLY SACRAMENT OF PENANCE

CANON VIII.--If any one saith, that the confession of all sins, such as it is observed in the Church, is impossible, and is a human tradition to be abolished by the godly; or that all and each of the faithful of Christ, of either sex, are not obliged thereunto once a year, conformably to the constitution of the great Council of Lateran, and that, for this cause, the faithful of Christ are to be persuaded not to con fess during Lent; let him be anathema.

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