is the eucharistic rite of the ancient Church of Jerusalem and the most ancient extant liturgy of the Eastern Church. In recent decades, the frequency of its use has increased throughout the Orthodox Church. This service book offers for the first time a parallel Church Slavonic-English text, suitable for use by clergy and servers. It also contains the Divine Liturgy of the Presanctified Gifts of the Holy Apostle James, which is rarely served today but has been preserved in part in a few Greek manuscripts and in full in several Georgian sources. An introduction by Dr. Vitaly Permiakov, a specialist in the Jerusalem liturgy, presents the provenance and integrity of both ancient Liturgical services.