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Pentecost is a prominent feast in the Christian liturgical year commemorating the descent of the Holy Spirit upon the disciples of Christ after the Resurrection of Jesus. The feast is also called Whit Sunday, Whitsun, or Whit, especially in the United Kingdom, where the following Monday was traditionally a holiday. Pentecost is celebrated seven weeks (50 days) after Easter Sunday, hence its name. Pentecost falls on the tenth day after Ascension Thursday.
Pentecost is historically and symbolically related to the Jewish harvest festival of Shavuot, which commemorates God giving the Ten Commandments at Mount Sinai fifty days after the Exodus. Among Christians, Pentecost commemorates the descent of the Holy Spirit upon the Twelve apostles and other followers of Jesus as described in the Acts of the Apostles 2:1-31. For this reason, Pentecost is sometimes described as the 'Birthday of the Church'.