The matter is one of Church discipline rather than personal sin. The Orthodox Church is characterised by its conciliar nature. Being hierarchical does not mean that the Church is governed in a top-down, autocratic way. The Church and its Divine Liturgy are the common action of the whole people of God, from patriarchs to the most humble laymen. It is not the Orthodox way to see any separation between clergy and laity; that would lead to the clericalisation of the Church and the fracture of the Body of Christ. Any source will confirm that the laity are the guardians of the faith along with the other people of God who hold the faith in its fullness and integrity, and, as already said, by 'faith' is meant the whole of the Holy Tradition of the Church and that (as confirmed, for example, on the Goarch web site) includes giving Holy Communion only to members of the Church who are in good order with it and have prepared themselves to receive.