The document discusses the Sacrament of Holy Communion, also known as the Lord's Supper or Eucharist. It explains that Jesus instituted this sacrament during the Last Supper before his crucifixion. He commanded his disciples to consume bread and wine in remembrance of his body and blood, which would be sacrificed for the forgiveness of sins. The sacrament offers the promise of forgiveness to all believers through the visible means of consecrated bread and wine, which symbolize Christ's body and blood given for mankind.