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 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.