People gathered under a common religious belief, to the exercise of any cultic activity, is a recurring fact in various religious traditions. For Christianity, however, the meeting of the Christians reaches a very particular significance and a special responsibility. It is the sacrament – an evocative sign and, at the same time, experience of what is evoked – of salvation. Its reality is so ingrained into the net of the salvific event, it cannot be considered separately, nor is it truly known by a reason closed to the possibilities of faith. Then, this dissertation proposes to pursue and develop the indications that point to a theology of the liturgical assembly, considering the place that has been destined to the assembleal reality. The approach of our research is historical-saving and sacramental: bringing together elements of biblical theology and liturgical ecclesiology, connected by incursions into historical context, our work shows the assembly as the mysterical place where is revealed and consummated the divine plan of salvation. Celebrating the memorial of Christ’s Passover and the other signs of the Paschal Mystery, the assembly expresses and confirms its sacramental and priestly, ministry and participative, historical and eschatological condition. Answers, finally, the Trinity’s call, blown in creation, verbalized in Sinai and embodied in Christ.