The Catechism in Questions & Answers

648. Is it necessary to proclaim the forgiveness of sins?

Yes, the forgiveness of sins must be proclaimed. The Apostles proclaim forgiveness of sins by the commission of Jesus in accordance with His words: “If you forgive the sins of any, they are forgiven them” (John 20: 23). They thereby make the sacrifice of Jesus accessible to the believers. The priestly ministers are authorised by the Apostles to do the same.