General Instruction of the Roman Missal: Chapter II, The Structure of the Mass, Its Elements and Its Parts
C. The Liturgy of the Eucharist
72At the Last Supper Christ instituted the Paschal Sacrifice and banquet, by which the Sacrifice of the Cross is continuously made present in the Church whenever the priest, representing Christ the Lord, carries out what the Lord himself did and handed over to his disciples to be done in his memory.[69]
For Christ took the bread and the chalice and gave thanks; he broke the bread and gave it to his disciples, saying, “Take, eat, and drink: this is my Body; this is the cup of my Blood. Do this in memory of me.” Accordingly, the Church has arranged the entire celebration of the Liturgy of the Eucharist in parts corresponding to precisely these words and actions of Christ:
At the Preparation of the Gifts, the bread and the wine with water are brought to the altar, the same elements that Christ took into his hands.
In the Eucharistic Prayer, thanks is given to God for the whole work of salvation, and the offerings become the Body and Blood of Christ.
Through the fraction and through Communion, the faithful, though they are many, receive from the one bread the Lord’s Body and from the one chalice the Lord’s Blood in the same way the Apostles received them from Christ’s own hands.
The Preparation of the Gifts
73At the beginning of the Liturgy of the Eucharist the gifts, which will become Christ’s Body and Blood, are brought to the altar.
First, the altar, the Lord’s table, which is the center of the whole Liturgy of the Eucharist,[70] is prepared by placing on it the corporal, purificator, Missal, and chalice (unless the chalice is prepared at the credence table).
The offerings are then brought forward. It is praiseworthy for the bread and wine to be presented by the faithful. They are then accepted at an appropriate place by the priest or the deacon and carried to the altar. Even though the faithful no longer bring from their own possessions the bread and wine intended for the liturgy as in the past, nevertheless the rite of carrying up the offerings still retains its force and its spiritual significance.
It is well also that money or other gifts for the poor or for the Church, brought by the faithful or collected in the church, should be received. These are to be put in a suitable place but away from the Eucharistic table.
74The procession bringing the gifts is accompanied by the Offertory chant (cf. no. 37b), which continues at least until the gifts have been placed on the altar. The norms on the manner of singing are the same as for the Entrance chant (cf. no. 48). Singing may always accompany the rite at the offertory, even when there is no procession with the gifts.
75The bread and wine are placed on the altar by the priest to the accompaniment of the prescribed formulas. The priest may incense the gifts placed upon the altar and then incense the cross and the altar itself, so as to signify the Church’s offering and prayer rising like incense in the sight of God. Next, the priest, because of his sacred ministry, and the people, by reason of their baptismal dignity, may be incensed by the deacon or another minister.
76The priest then washes his hands at the side of the altar, a rite that is an expression of his desire for interior purification.
The Prayer over the Offerings
77Once the offerings have been placed on the altar and the accompanying rites completed, the invitation to pray with the priest and the prayer over the offerings conclude the preparation of the gifts and prepare for the Eucharistic Prayer.
In the Mass, only one Prayer over the Offerings is said, and it ends with the shorter conclusion: Per Christum Dominum nostrum (Through Christ our Lord). If, however, the Son is mentioned at the end of this prayer, the conclusion is, Qui vivit et regnat in saecula saeculorum (Who lives and reigns forever and ever).
The people, uniting themselves to this entreaty, make the prayer their own with the acclamation, Amen.
The Eucharistic Prayer
78Now the center and summit of the entire celebration begins: namely, the Eucharistic Prayer, that is, the prayer of thanksgiving and sanctification. The priest invites the people to lift up their hearts to the Lord in prayer and thanksgiving; he unites the congregation with himself in the prayer that he addresses in the name of the entire community to God the Father through Jesus Christ in the Holy Spirit. Furthermore, the meaning of the Prayer is that the entire congregation of the faithful should join itself with Christ in confessing the great deeds of God and in the offering of Sacrifice. The Eucharistic Prayer demands that all listen to it with reverence and in silence.
79The chief elements making up the Eucharistic Prayer may be distinguished in this way:
Thanksgiving (expressed especially in the Preface): In which the priest, in the name of the entire holy people, glorifies God the Father and gives thanks for the whole work of salvation or for some special aspect of it that corresponds to the day, festivity, or season.
Acclamation: In which the whole congregation, joining with the heavenly powers, sings the Sanctus. This acclamation, which is part of the Eucharistic Prayer itself, is sung or said by all the people with the priest.
Epiclesis: In which, by means of particular invocations, the Church implores the power of the Holy Spirit that the gifts offered by human hands be consecrated, that is, become Christ’s Body and Blood, and that the spotless Victim to be received in Communion be for the salvation of those who will partake of it.
Institution narrative and consecration: In which, by means of words and actions of Christ, the Sacrifice is carried out which Christ himself instituted at the Last Supper, when he offered his Body and Blood under the species of bread and wine, gave them to his Apostles to eat and drink, and left them the command to perpetuate this same mystery.
Anamnesis: In which the Church, fulfilling the command that she received from Christ the Lord through the Apostles, keeps the memorial of Christ, recalling especially his blessed Passion, glorious Resurrection, and Ascension into heaven.
Offering: By which, in this very memorial, the Church—and in particular the Church here and now gathered—offers in the Holy Spirit the spotless Victim to the Father. The Church’s intention, however, is that the faithful not only offer this spotless Victim but also learn to offer themselves,[71] and so day by day to be consummated, through Christ the Mediator, into unity with God and with each other, so that at last God may be all in all.[72]
Intercessions: By which expression is given to the fact that the Eucharist is celebrated in communion with the entire Church, of heaven as well as of earth, and that the offering is made for her and for all her members, living and dead, who have been called to participate in the redemption and the salvation purchased by Christ’s Body and Blood.
Final doxology: By which the glorification of God is expressed and which is confirmed and concluded by the people’s acclamation, Amen.
The Communion Rite
80Since the Eucharistic Celebration is the Paschal Banquet, it is desirable that in keeping with the Lord’s command, his Body and Blood should be received as spiritual food by the faithful who are properly disposed. This is the sense of the fraction and the other preparatory rites by which the faithful are led directly to Communion.
The Lord’s Prayer
81In the Lord’s Prayer a petition is made for daily food, which for Christians means preeminently the Eucharistic bread, and also for purification from sin, so that what is holy may, in fact, be given to those who are holy. The priest says the invitation to the prayer, and all the faithful say it with him; the priest alone adds the embolism, which the people conclude with a doxology. The embolism, enlarging upon the last petition of the Lord’s Prayer itself, begs deliverance from the power of evil for the entire community of the faithful.
The invitation, the Prayer itself, the embolism, and the doxology by which the people conclude these things are sung or said aloud.
The Rite of Peace
82The Rite of Peace follows, by which the Church asks for peace and unity for herself and for the whole human family, and the faithful express to each other their ecclesial communion and mutual charity before communicating in the Sacrament.
As for the sign of peace to be given, the manner is to be established by Conferences of Bishops in accordance with the culture and customs of the peoples. It is, however, appropriate that each person offer the sign of peace only to those who are nearest and in a sober manner.
The Fraction
83The priest breaks the Eucharistic Bread, assisted, if the case calls for it, by the deacon or a concelebrant. Christ’s gesture of breaking bread at the Last Supper, which gave the entire Eucharistic Action its name in apostolic times, signifies that the many faithful are made one body (1 Cor 10:17) by receiving Communion from the one Bread of Life which is Christ, who died and rose for the salvation of the world. The fraction or breaking of bread is begun after the sign of peace and is carried out with proper reverence, though it should not be unnecessarily prolonged, nor should it be accorded undue importance. This rite is reserved to the priest and the deacon.
The priest breaks the Bread and puts a piece of the host into the chalice to signify the unity of the Body and Blood of the Lord in the work of salvation, namely, of the living and glorious Body of Jesus Christ. The supplication Agnus Dei, is, as a rule, sung by the choir or cantor with the congregation responding; or it is, at least, recited aloud. This invocation accompanies the fraction and, for this reason, may be repeated as many times as necessary until the rite has reached its conclusion, the last time ending with the words dona nobis pacem (grant us peace).
Communion
84The priest prepares himself by a prayer, said quietly, that he may fruitfully receive Christ’s Body and Blood. The faithful do the same, praying silently.
The priest next shows the faithful the Eucharistic Bread, holding it above the paten or above the chalice, and invites them to the banquet of Christ. Along with the faithful, he then makes an act of humility using the prescribed words taken from the Gospels.
85It is most desirable that the faithful, just as the priest himself is bound to do, receive the Lord’s Body from hosts consecrated at the same Mass and that, in the instances when it is permitted, they partake of the chalice (cf. no. 283), so that even by means of the signs Communion will stand out more clearly as a participation in the sacrifice actually being celebrated.[73]
86While the priest is receiving the Sacrament, the Communion chant is begun. Its purpose is to express the communicants’ union in spirit by means of the unity of their voices, to show joy of heart, and to highlight more clearly the “communitarian” nature of the procession to receive Communion. The singing is continued for as long as the Sacrament is being administered to the faithful.[74] If, however, there is to be a hymn after Communion, the Communion chant should be ended in a timely manner.
Care should be taken that singers, too, can receive Communion with ease.
87In the dioceses of the United States of America there are four options for the Communion chant: (1) the antiphon from The Roman Missal or the Psalm from the Roman Gradual as set to music there or in another musical setting; (2) the seasonal antiphon and Psalm of the Simple Gradual; (3) a song from another collection of psalms and antiphons, approved by the United States Conference of Catholic Bishops or the diocesan Bishop, including psalms arranged in responsorial or metrical forms; (4) a suitable liturgical song chosen in accordance with no. 86. This is sung either by the choir alone or by the choir or cantor with the people.
If there is no singing, however, the Communion antiphon found in the Missal may be recited either by the faithful, or by some of them, or by a lector. Otherwise the priest himself says it after he has received Communion and before he distributes Communion to the faithful.
88When the distribution of Communion is finished, as circumstances suggest, the priest and faithful spend some time praying privately. If desired, a psalm or other canticle of praise or a hymn may also be sung by the entire congregation.
89To bring to completion the prayer of the People of God, and also to conclude the entire Communion Rite, the priest says the Prayer after Communion, in which he prays for the fruits of the mystery just celebrated.
In the Mass only one prayer after Communion is said, which ends with a shorter conclusion; that is,
If the prayer is directed to the Father: Per Christum Dominum nostrum (Through Christ our Lord);
If it is directed to the Father, but the Son is mentioned at the end: Qui vivit et regnat in saecula saeculorum (Who lives and reigns forever and ever);
If it is directed to the Son: Qui vivis et regnas in saecula saeculorum (You live and reign forever and ever).
The people make the prayer their own by the acclamation, Amen.
D. The Concluding Rites
90The concluding rites consist of
Brief announcements, if they are necessary;
The priest’s greeting and blessing, which on certain days and occasions is enriched and expressed in the prayer over the People or another more solemn formula;
The dismissal of the people by the deacon or the priest, so that each may go out to do good works, praising and blessing God;
The kissing of the altar by the priest and the deacon, followed by a profound bow to the altar by the priest, the deacon, and the other ministers.