“When the most High came down and confused the tongues, He divided the nations; But when he distributed the tongues of fire He called all to unity. Therefore, with one voice, we glorify the All-holy Spirit!”
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.
An extraordinary service called the Kneeling Vespers, is observed on the evening of Pentecost. This is a Vespers service to which are added three sets of long poetical prayers, the composition of Saint Basil the Great, during which everyone makes a full prostration, touching their foreheads to the floor. In many parishes, this service is done immediately after the Liturgy.