About the participation of the faithful in the Eucharist (Communion)
Eucharist is the main Sacrament of the Church, established by the Lord Jesus Christ on the eve of His saving sufferings, death on the cross, and resurrection. Participation in the Eucharist and the Communion of the Body and Blood of Christ is the commandment of the Savior, through His disciples, telling all Christians: "Take, eat: this is My Body" and "drink from it all, for this is My Blood of the New Testament" (Matt. 26, 26-28). The Church itself is the Body of Christ, and therefore the Sacrament of the Body and Blood of Christ visibly reveals the mystical nature of the Church, building the church community.
The spiritual life of an Orthodox Christian is unthinkable without the communion of the Holy Mysteries. By partaking in the Holy Gifts, believers are sanctified by the power of the Holy Spirit and unite with Christ the Savior and with each other, making up the one Body of Christ.
The sacrament of the Eucharist requires special preparation for it. In the Church, time itself - whether it is the time of human life or the history of all mankind - is expectation and preparation for meeting with Christ, and the whole rhythm of liturgical life is waiting and preparing for the Divine Liturgy and, accordingly, for communion, for which it is performed.