 So our Catholic Mass is divided into two parts, the Liturgy of the Word, the Liturgy of the Eucharist. Liturgy of the Word is opening up the Old Testament, singing the Psalms, the Gospel, a teaching. But the Liturgy of the Eucharist is the offering of the sacrifice on the altar in the presence of God. And so what Christ did was join the synagogue service and temple worship in the one place, in the one ceremony.