The Divine Liturgy is the primary worship service of the Eastern Christianity and some Eastern Rite Catholic churches. The Divine Liturgy is a eucharistic service. It contains two parts: the Liturgy of the Catechumens, sometimes called the Liturgy of the Word, at which the Scriptures are proclaimed and expounded, and the Liturgy of the Faithful, sometimes called the Liturgy of the Eucharist, in which the gifts of bread and wine are offered and consecrated. The Church teaches that the gifts truly become the body and blood of Jesus Christ, but it has never dogmatized a particular formula for describing this transformation. The Prothesis (or proskomedia), the service of preparing the holy gifts, can be considered a third part which precedes the beginning of the Liturgy proper.