Catechism of the Catholic Church

Holy Communion, because by this sacrament we unite ourselves to Christ, who makes us sharers in his Body and Blood to form a single body. We also call it: the holy things (ta hagia; sancta)-the first meaning of the phrase "communion of saints" in the Apostles' Creed-the bread of angels, bread from heaven, medicine of immortality, viaticum.... (950, 948, 1405)