The document summarizes the first chapter of Acts, focusing on Jesus equipping the apostles for ministry through promising them the Holy Spirit. It describes how the apostles prayed together in Jerusalem as they waited for Pentecost. When Judas betrayed Jesus, they chose Matthias to replace him based on qualifications of being with them from Jesus' baptism to resurrection. The stage is now set for the apostles to receive power from the Holy Spirit to be Jesus' witnesses.