Pentecost is a Jewish feast that occurs 50 days after the Passover sabbath. Jesus was crucified during the Passover and was on the earth for 40 days after His resurrection (Acts 1:3), so 10 days after He ascended back to heaven would be the Day of Pentecost (40+10=50).
The apostles had been instructed to wait in Jerusalem. Before He ascended Jesus “commanded them not to depart from Jerusalem, but to wait for the Promise of the Father, “which,” He said, “you have heard from Me; “for John truly baptized with water, but you shall be baptized with the Holy Spirit not many days from now.” (Acts 1:4-5).
In Acts 2 the Holy Spirit came upon the apostles and enabled them to preach about Jesus for the first time. Jerusalem was crowded with Jews who had come for the feast. They needed to hear the gospel!
Read his message in Acts 2:22-36.
What do you see as the main point of Peter’s preaching?
How did the people feel as they came face to face with the fact that they had killed the son of God? (37)
What did Peter tell them to do? (38)
This truly is a turning point because it is the beginning of the church. How many believers were there in Acts 1:15? How many people were added to the number of the disciples on this day? (See verse 41). How many do you see in Acts 4:4?