"The 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 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."
In speaking of the bread to be used at Mass, the General Instruction, 321 recommends that
"the eucharistic bread... be made in such a way that the priest at Mass with a congregation is able in practice to break it into parts for distribution to at least some of the faithful. Small hosts are, however, in no way ruled out when the number of those receiving Holy Communion or other pastoral needs require it. The action of the fraction or breaking of bread, which gave its name to the Eucharist in apostolic times, will bring out more clearly the force and importance of the sign of unity of all in the one bread, and of the sign of charity by the fact that the one bread is distributed among the brothers and sisters."
In the of the Western Orthodox Church, in which leavened bread is used exclusively, the fraction occurs immediately after the anaphora and prior to the Our Father with its introduction. This is slightly earlier than in other western rites, in which the fraction typically takes place at some point after the Our Father. The method of the fraction varies from a simple breaking into pieces by hand to a more elaborate cutting with a liturgical knife known as a spear, as is commonly done in the Byzantine rite. The action is accompanied by the singing of a responsory drawn both from the Emmaus account in the Gospel of Luke and a selection from the opening verses of chapter 9 of the Book of Proverbs.
Wisdom has built her house; she has founded it on her seven pillars; she has sacrificed her victims, mingled her wine, and set her table. They recognised the Lord. Alleluia. In the breaking of the bread. Alleluia. Alleluia. Come and eat of my bread, and drink of the wine which I have mixed. Leave ignorance and you shall live. They recognised the Lord. Alleluia. In the breaking of the bread. Alleluia. Alleluia. The bread which we break is the Body of the Lord; the cup which we bless is the Blood of the Lord: a sole and unique Mystery. They recognised the Lord. Alleluia. In the breaking of the bread. Alleluia. Alleluia.
From Septuagesima until the end of Holy Week, the alleluia is omitted, and the responsory is sung more simply to Gregorian psalm tone 2.
Anglican
In the churches of the Anglican Communion, the rite is similar to that practised in the Roman Catholic Church, and consists of the priest breaking the Host in half and making an exclamation, such as, "We break this bread to share in the body of Christ", and the faithful making a response, such as, "Though we are many we are one body, because we all share in one bread" The response may change during certain liturgical seasons, or according to the rite being celebrated. A Fraction Anthem may be sung or spoken during the rite.
Eastern Christian
In the Eastern Orthodox Church and Eastern Catholic Churches of the Byzantine rite, leavened bread is used for the Eucharist. The round loaves, or prosphora, are stamped so that a Greek cross is in the center, with the letters "IC XC NI-KA" occupying the quarters formed by the cross' arms. The square portion occupied by this stamp, the "Lamb", is cut out before the Divine Liturgy during the preparatory rite and is the only part consecrated during the Epiclesis. As part of the Liturgy of Preparation, the priest cuts the Lamb part way through crosswise into four sections from the bottom, leaving the bread united by the stamped crust on top. At the Fraction, which follows the Lord's Prayer and the Elevation, the celebrant breaks the Lamb into four portions along the cuts already made, as he says the words: "Broken and divided is the Lamb of God, which is broken and not disunited, which is ever eaten and never consumed, but sanctifieth those that partake thereof." He then arranges the four pieces crosswise on the edge of the diskos. On the invitation of the deacon, "Fill, Master, the holy chalice," the celebrant takes the piece with the letters "IC" and places it into the chalice saying, "The fulness of the cup, of the faith, of the Holy Spirit." The portion with the letters "XC" is used for the communion of the clergy. The two portions "NI" and "KA" are divided into small pieces and placed in the chalice for the communion of the people. The portion "IC" is not used for communion, but is consumed by the deacon along with any other consecrated elements left over at the end of the Liturgy.
