beginning of a continual outpouring that would be available to all believers from that point on, Jews and Gentiles alike. Leo's sermons Scholars believe that Pope Leo I's Sermons 75–77 were given on Pentecost Sunday. In these sermons, dating to the 5th century, Leo discusses Macedonianism, which the Catholic Church denounced as heresy because Macedonianism considered the Holy Spirit inferior to the Father and Son, thereby undermining the Trinity. He also denounces Manichean doctrine on the Holy Spirit, which taught that the Holy Spirit was present in Mani. Leo discusses other Catholic doctrine pertaining to the Holy Spirit, especially emphasizing the Spirit's relationship to the Father and Son of the Trinity and the Catholic Church. He draws an analogy between Jewish practices and the Christian feast day: "As once to the Hebrew people, freed from Egypt, the law was given on Mt. Sinai on the fiftieth day after the sacrifice of the lamb, so after the Passion of the Christ when the true Lamb of God was killed, on the fiftieth day from his Resurrection, the Holy Spirit came down on the apostles and the community of believers." Leo calls this the Second Covenant and says that it is "established by the same Spirit who has set up the first". He describes the descent of the Holy Spirit upon the disciples on Pentecost as the fulfillment of a "long-awaited promise". Apocryphal/Deuterocanonical books In is used as an alternate name for the Jewish holiday of Shavuot. The NABRE translation of this passage reads: "on our festival of Pentecost, the holy feast of Weeks". Liturgical celebration Eastern churches In the Coptic Orthodox Church of Alexandria, Pentecost is one of the seven Major "Lord's Feasts". In the Eastern Orthodox Church, Pentecost is one of the Orthodox Great Feasts and is considered to be the highest ranking Great Feast of the Lord, second in rank only to Pascha (Easter). The service is celebrated with an All-night Vigil on the eve of the feast day, and the Divine Liturgy on the day of the feast itself. Orthodox churches are often decorated with greenery and flowers on this feast day, and the celebration is intentionally similar to the Jewish holiday of Shavuot, which celebrates the giving of the Mosaic Law. The feast itself lasts three days. The first day is known as "Trinity Sunday"; the second day is known as "Spirit Monday" (or "Monday of the