“What is the day of Pentecost?”“Pentecost” is significant in both the Old and the New Testaments. Pentecost is actually the Greek name for a festival known in the Old Testament as the Feast of Weeks (Leviticus 23:15Deuteronomy 16:9). The Greek word means “fifty” and refers to the fifty days that have elapsed since the wave offering of Passover. The Feast of Weeks celebrated the end of the grain harvest. Most interesting, however, is its use in Joel and Acts. Looking back to Joel’s prophecy (Joel 2:8-32) and forward to the promise of the Holy Spirit in Christ’s last words on earth before His ascension into heaven (Acts 1:8), Pentecost signals the beginning of the church age.The only reference to the actual events of Pentecost is Acts 2:1-3. Pentecost is reminiscent of the Last Supper; in both instances the disciples are together in a house for what proves to be an important event. At the Last Supper the disciples witness the end of the Messiah’s earthly ministry as He asks them to remember Him after His death until He returns. At Pentecost, the disciples witness the birth of the New Testament church in the coming of the Holy Spirit to indwell all believers. Thus the scene of the disciples in a room at Pentecost commences with the beginning of the Holy Spirit’s work in the church with the conclusion of Christ’s earthly ministry in the upper room before the crucifixion.The description of fire and wind mentioned in the Pentecost account resounds throughout the Old and the New Testament. The wind at Pentecost was “rushing” and “mighty,” a powerful wind that nevertheless did not extinguish the tongues of fire. Scriptural references to the power of wind (always understood to be under God’s control) abound. Exodus 10:13Psalm 18:42 and Isaiah 11:15 in the Old Testament and Matthew 14:23-32 in the New Testament are only a few examples. More significant than wind as power is wind as life in the Old Testament (Job 12:10) and as spirit in the New (John 3:8). Just as the first Adam received the breath of physical life (Genesis 2:7), so the second Adam, Jesus, brings the breath of spiritual life. The idea of spiritual life as generated by the Holy Spirit is certainly implicit in the wind at Pentecost.Fire is often associated in the Old Testament with the presence of God (Exodus 3:213:21-2224:17Isaiah 10:17) and with His holiness (Psalm 97:3Malachi 3:2). Likewise in the New Testament, fire is associated with the presence of God (Hebrews 12:29) and the purification He can bring about in human life (Revelation 3:18). God’s presence and holiness are implied in the Pentecostal tongues of fire. Indeed, fire is identified with Christ Himself (Revelation 1:1419:12); this association naturally underlies the Pentecost gift of the Holy Spirit, who would teach the disciples the things of Christ (John 16:14).Another aspect of the Day of Pentecost is the miraculous speaking in foreign tongues which enabled people from various language groups to understand the message of the apostles. In addition is the bold and incisive preaching of Peter to a Jewish audience. The effect of the sermon was powerful, as listeners were “cut to the heart” (Acts 2:37) and instructed by Peter to “repent, and be baptized” (Acts 2:38). The narrative concludes with three thousand souls being added to the fellowship, the breaking of bread and prayers, apostolic signs and wonders, and a utopian community formed in which everyone’s needs were met.