The 11 remaining Apostles returned to Jerusalem after the Ascension of Jesus into Heaven. Acts 1:14 says, “All these with one accord devoted themselves to prayer, together with the women and Mary the mother of Jesus, and with his brethren.” During this time, the Apostles chose a replacement for Judas Iscariot. They cast lots between two men, and the lot fell on Matthias.

After nine days of prayer, the Holy Spirit descended upon the disciples. They heard a sound like a “mighty wind,” and “tongues as of fire” were resting on their heads.

Going out, Peter to the crowd that had gathered. Even though, just a few weeks earlier, he had denied Christ three times, Peter courageously proclaimed the Gospel. That day, three thousand people believed in Christ and were received into His Church.

When the Holy Spirit descended on the disciples, they immediately began proclaiming the Gospel. In fact, three thousand people were baptized that day. The disciples, through the gift of the Holy Spirit, were answering Jesus’ call to “Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit” (Matthew 28:19). The Holy Spirit is vital in the mission and witness of the Church, so we consider Pentecost the birthday of the Church. *

“The Spirit of the Lord within you is so overwhelming that it should be the most important and visible thing in your entire life.”          Mother Angelica

* ewtn.com