Shavuot (also known as the Feast of Weeks) commemorates the revelation of the Torah on Mount Sinai to the Jewish people through Moses, and occurs on the 50th day after the 49 days of counting the Omer. Shavuot is one of the three biblically based pilgrimage holidays and is associated with the grain harvest in the Torah.
In the New Testament, the Spirit comes to the disciples at Shavuot (Pentecost), where Acts 2 reminds us, "When the day of Shavuot came, they were all together in one place. Suddenly a sound like the blowing of a violent wind came from heaven and filled the whole house where they were sitting. They saw what seemed to be tongues of fire that separated and came to rest on each of them. All of them were filled with the Holy Spirit and began to speak in other tongues as the Spirit enabled them."