Small Catechism for Memorizing - Trinity III (June 8)

Confession: Where is this written (concerning the Office of the Keys)?
This is what St. John the Evangelist writes in chapter twenty: The Lord Jesus breathed on His disciples and said, “Receive the Holy Spirit. If you forgive anyone his sins, they are forgiven; if you do not forgive them, they are not forgiven.” (John 20:22-23)