The Prayer of the Faithful
69. In the Prayer of the Faithful, the people respond in a certain way to the word of God which they have welcomed in faith and, exercising the office of their baptismal priesthood, offer prayers to God for the salvation of all. It is fitting that such a prayer be included, as a rule, in Masses celebrated with a congregation, so that petitions will be offered for the holy Church, for civil authorities, for those weighed down by various needs, for all men and women, and for the salvation of the whole world.[67]
70. As a rule, the series of intentions is to be
a. For the needs of the Church;
b. For public authorities and the salvation of the whole world;
c. For those burdened by any kind of difficulty;
d. For the local community.
Nevertheless, in a particular celebration, such as Confirmation, Marriage, or a Funeral, the series of intentions may reflect more closely the particular occasion.
71. It is for the priest celebrant to direct this prayer from the chair. He himself begins it with a brief introduction, by which he invites the faithful to pray, and likewise he concludes it with a prayer. The intentions announced should be sober, be composed freely but prudently, and be succinct, and they should express the prayer of the entire community.
The intentions are announced from the ambo or from another suitable place, by the deacon or by a cantor, a lector, or one of the lay faithful.[68]
The people, however, stand and give expression to their prayer either by an invocation said together after each intention or by praying in silence.
C. The Liturgy of the Eucharist
72. At 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
73. At 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.
74. The 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.
75. The 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.
76. The priest then washes his hands at the side of the altar, a rite that is an expression of his desire for interior purification.
From: GENERAL INSTRUCTION OF THE ROMAN MISSAL