The book of Acts is an introduction to Christianity. There are three simple subjects examined in the book. First, Acts reveals the day that Christ's kingdom, the church, was established. Secondly, we find the beginnings of preachers, apostles, and prophets teaching the gospel of Jesus Christ to a lost and dying world. Thirdly, we find varying responses to the gospel message. Some people believed some people disbelieved. Those who believed were added to the Lord's church and it grew exponentially during these early days. Though the object of the book is very simple its effects upon man's history is profound. Two thousand plus years have passed since the church was established. The gospel message continues to be preached and people continue to have varying responses to truth.
Interestingly, when Mary was pregnant with Jesus, an angel appears to her and reveals the child's identity. The angel said, "You shall conceive in your womb, and bring forth a son, and shall call his name Jesus. He shall be great, and shall be called the Son of the Most High: and the Lord God shall give unto him the throne of his father David: and he shall reign over the house of Jacob forever; and of his kingdom there shall be no end" (Luke 1:30-33). Luke precisely identifies Christ as the king of this future kingdom at Acts 2:30-33. Jesus is the king of the kingdom that was foretold of coming in the Old Testament (see John 18:36-37)
The prophets of God also foretold of the time that his kingdom would be established. Isaiah and Daniel tell us that God's everlasting kingdom would be established in the "latter days" (Isaiah 2:2-3 and Daniel 2:28).
Jerusalem would be the location of its beginnings (Isaiah 2:2-4). When Jesus came into the world John the baptizer said "the kingdom of heaven is at hand' (Matthew 3:1-3). Jesus said that there were some alive listening to him preach that would remain alive and see the kingdom of God established (Mark 9:1). When the Day of Pentecost had come Peter said that the events the people were now witnessing were the things that the prophets said would occur in the "latter days" (Acts 2:16-17).
Jesus said that the disciples would know when his kingdom was established because it would come with power (see Mark 9:1; Luke 24:49 and Acts 1:6-8). When the Day of Pentecost came at Acts 2 the apostles received this power (see Acts 2:1-4).
The prophets of old also foretold that God's eternal kingdom would be established in Jerusalem at the time that his law went forth to man (see Isaiah 2:2-3 and Luke 24:45-49). Matthew said that Jesus would "save his people from their sins" (Matthew 1:21). When the Day of Pentecost arrived the apostles were in Jerusalem and Peter preached the law of Christ that would enable men to be forgiven of their sins (see Acts 2: 1, 5, 37-38).
God's kingdom was established on the Day of Pentecost as recorded in Acts chapter 2. The kingdom of God is the church of Jesus Christ. Those who heard, believed, and were baptized for the remission of their sins did so because the gospel of Jesus Christ "called" upon them to do so (see Acts 2:37-39 and 2 Thessalonians 13-14). The Apostle Paul said that the gospel "calls" people to enter into his Kingdom (see 1 Thessalonians 2:13-14). Again, Paul said that those who have been called by the gospel message receive the remission of their sins and they are translated into the kingdom of God (see Colossians 1:12-13). When we read past Acts 2 we read of the church (kingdom of God) now existing (see Acts 5:11; 8:1 etc.).
John C Robertson