Acts 1 is the opening chapter of the book of Acts, which is the second part of the New Testament. It begins with a brief summary of the events of Jesus' life, death, and resurrection, as well as the ascension of Jesus into heaven. This is followed by a description of the gathering of the disciples in Jerusalem, where they are instructed by Jesus to wait for the coming of the Holy Spirit.
The chapter then focuses on the election of Matthias to replace Judas Iscariot as one of the twelve apostles. This is done by casting lots, which is a method of making a decision by chance. This is significant because it shows that the selection of the apostles was not done by human will, but by the will of God.
The chapter ends with the disciples praying and praising God, and then being filled with the Holy Spirit. This is a powerful moment, as it marks the beginning of the spread of the gospel and the growth of the early church.
Overall, this chapter serves as an introduction to the book of Acts, and sets the stage for the events that will follow. It emphasizes the importance of the Holy Spirit in the life of the church, and the need for the disciples to be obedient to God's will. It also shows the importance of prayer and praise in the life of the believer.