Sacrosanctum Concilium §42

⁴² But because it is impossible for the bishop always and everywhere to preside over the whole flock in his Church, he cannot do other than establish lesser groupings of the faithful. Among these the parishes, set up locally under a pastor who takes the place of the bishop, are the most important: for in some manner they represent the visible Church constituted throughout the world. And therefore the liturgical life of the parish and its relationship to the bishop must be fostered theoretically and practically among the faithful and clergy; efforts also must be made to encourage a sense of community within the parish, above all in the common celebration of the Sunday Mass. F) The Promotion of Pastoral-Liturgical Action