Redemptoris Missio §26

²⁶ The Spirit leads the company of believers to "form a community," to be the Church. After Peter's first proclamation on the day of Pentecost and the conversions that followed, the first community takes shape (cf. Acts 2:42-47; 4:32-35). One of the central purposes of mission is to bring people together in hearing the Gospel, in fraternal communion, in prayer and in the Eucharist. To live in "fraternal communion" ( koinonia ) means to be "of one heart and soul" (Acts 4:32), establishing fellowship from every point of view: human, spiritual and material. Indeed, a true Christian community is also committed to distributing earthly goods, so that no one is in want, and all can receive such goods "as they need" (cf. Acts 2:45; 4:35). The first communities, made up of "glad and generous hearts" (Acts 2:46), were open and missionary: they enjoyed "favor with all the people" (Acts 2:47). Even before activity, mission means witness and a way of life that shines out to others.