CCC 1331 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.1 We also call it: the holy things (ta hagia; sancta)2 – the first meaning of the phrase “communion of saints” in the Apostles’ Creed – the bread of angels, bread from heaven, medicine of immortality,3 viaticum...

1 Cf. 1 Cor 1016-17.
2 Apostolic Constitutions 8, 13,12 PG 1,1108; Didache 9, 5; 10:6: SCh: 248,176- 178.
3 St. Ignatius of Antioch, Ad Eph. 20, 2 SCh 10, 76.