The central worship service of the Orthodox Church, celebrating the Eucharist (Holy Communion). Usually celebrated on Sundays and feast days, the Divine Liturgy consists of the Liturgy of the Word (scripture readings) and Liturgy of the Faithful (Eucharistic prayer and communion). The most common forms are the Liturgies of St. John Chrysostom and St. Basil the Great.

The joint celebration of Saints Basil the Great, Gregory the Theologian, and John Chrysostom on January 30th. These three great Church Fathers and theologians were honored together to end disputes over which was greatest. They represent the unity of Orthodox theology, liturgy, and pastoral care. This feast is especially important in Orthodox education.