Pentecost was derived from the Greek word “Pentecostos" meaning fifty days after Passover, and it commemorates the descent of the Holy Spirit upon the Apostles and other followers of Jesus Christ while they were in Jerusalem as described in the Acts of the Apostles (Acts 2:1–31). Before the events of the first Pentecost, there were followers of Jesus, but no movement that could be meaningfully called “the church.” Thus, from a historical point of view, Pentecost is the day on which the church was started. This is also true from a spiritual perspective, since the Spirit brings the church into existence and enlivens it. Thus Pentecost is the church’s birthday.
As Christians, we are to live in the presence and power of the Spirit of God. For the Holy Spirit helps us to confess Jesus as Lord, empowers us to serve God, binds us together as the body of Christ (1 Cor. 12:3-13); helps us to pray, and even intercedes for us with God the Father (Rom. 8:26-27).
Pentecost presents us with an opportunity to consider how we are living each day, and it offers us a chance to confess our failure to live by the Spirit and to ask the Lord to fill us afresh with His power.
“But you will receive power when the Holy Spirit comes on you, and you will be my witnesses in Jerusalem, and in all Judea and Samaria and to the ends of the earth” Acts1: 8