Pentecost is the 50th day of Easter, and the climax of the Easter season. It is sometimes called the Birthday of the Church, and for good reason. On this day, fresh from the Ascension event, the disciples of Jesus received the Holy Spirit and were sent on their mission to bring Christ to the world.
The expression “Holy Spirit” appears four times in Mark, five times in Matthew, 13 times in Luke, and 41 times in Acts. Because of this, Luke is sometimes called the Evangelist of the Holy Spirit and, in Acts, he highlights the Spirit’s impact on the life of the Church. Here is some line-by-line commentary on the First Reading.
“When the time for Pentecost was fulfilled. . .”
We are accustomed to thinking of the word “Pentecost” within a Christian context, but Pentecost was originally a Jewish harvest festival to celebrate the giving of the Law to Moses on Mt. Sinai, traditionally rendered as fifty days after the Exodus. Recall that in the Book of Exodus, Moses’ climb up Sinai was accompanied by thunder, lightning, loud trumpet blasts, and smoke. The Lord appeared in the form of fire and presented Moses with the Ten Commandments that would define the Israelites as a unique people. This is a pre-figuration of how the Holy Spirit would define the identity of the Church.
“They were all in one place together. And suddenly there came from the sky a noise like a strong driving wind. . .”
Thus, there was a physical manifestation of the Holy Spirit, much like the physical manifestation of God at Sinai.
“Then there appeared to them tongues as of fire, which parted and came to rest on each one of them. . .”
To Moses alone on Mt. Sinai, the Lord appeared as fire, and so too does the Holy Spirit at the house where the apostles were gathered. But the Spirit’s fire is divided and shared with ALL present, who represent the new Israel.
“All were filled with the Holy Spirit and began to speak in different tongues, as the Spirit enabled them to proclaim. . .”
There is an immediate change in those touched by the Spirit. Those gathered there on Pentecost were given the gift to speak in new languages that would immediately impact their ministry.
"Now there were devout Jews from every nation under heaven staying in Jerusalem. At this sound, they gathered in a large crowd, but they were confused because each one heard them speaking in his own language. . .”
Because of the Jewish Feast of Pentecost, the city was filled with people “from every nation.” Thus, the Good News of Jesus Christ is revealed to be a message of hope that would go beyond the borders of Israel and Judah. Through the power of the Holy Spirit, this message goes out to the whole world.