Pentecost was originally an Old Testament festival, calculated as beginning on the fiftieth day after the beginning of Passover. In the Christian calendar, it falls on the seventh Sunday after Easter. It was called the Feast of Weeks (Shavuot), and in the Old Testament was originally an agricultural festival celebrating and giving thanks for the "first fruits" of the early spring harvest (Leviticus 23, Exodus 23, 34).
By the early New Testament period, it had gradually lost its association with agriculture and became associated with the celebration of God’s creation of His people and their religious history. By the destruction of Jerusalem in AD 70, the festival focused exclusively on God’s gracious gift of Torah (the "Law") on Mount Sinai.
The account of Pentecost occurs in Acts 2 in the familiar scene of the outpouring of the Holy Spirit on those in the "upper room." The New Testament writers associate the events of Acts 2 with Pentecost, and relate it to the prophecies of Joel 2 and promises of Jesus (Acts 1:8). In both, the emphasis is on a empowerment through the Holy Spirit to enable the people of God to witness to Jesus the Christ.
The sanctuary color for Pentecost Sunday is red, the color of the church. The red symbolizes both the fire of Pentecost as well as the apostles and early followers of Jesus who were gathered in the Upper Room for the empowerment from God to proclaim the Gospel throughout the world. Sundays after Pentecost use green paraments symbolizing the growth of the Christian church, and how the Spirit helps keep us alive and growing in the body of believers.
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