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Altar cards are three cards placed on the altar during the Tridentine Mass. They contain certain prayers that the priest must say during the Mass, and their only purpose is as a memory aid, although they are usually very beautifully decorated.
Contents
History
Altar cards were not used before the sixteenth century, and even today they are not used when a bishop celebrates the traditional Mass, because he reads the entire Mass from the Pontifical Canon. When Pope St. Pius V restored the Missal, only the card at the middle of the altar was used, and it was called the "Tabella Secretarum". The left card was added first, and then the right one was added for the sake of symmetry.
Content of the cards
The altar card on the left contains the Last Gospel (John 1:1–14), which is said at the very end of the Mass. The card on the right contains the prayer for blessing the wine and water ("Deus qui humanæ substantiæ") and the Lavabo ("I shall wash", from the words of Psalm 26[25 in the Septuagint/Vulgate]:6–12).
The centre card contains the Gloria, the prayer Munda cor meum, which the priest recites before reading the Gospel, the Credo, the prayer for offering the Host (Suscipe, Sancte Pater), the words of Consecration and several of the prayers of the Canon of the Mass. Usually, the card's centre contains a picture of the Crucifixion.
Uses and regulations of altar cards
The altar cards may only stand on the altar during Mass. The center one stands against the Tabernacle, altar cross or other support, and the left and right ones stand against either the candlesticks or the superstructural steps of the altar. After Mass, they must either be removed or placed face downwards under the altar cover. The cards must be removed for Exposition of the Blessed Sacrament.