Acts 1:1-3

To Theophilus. The first book I wrote was about everything Jesus began to do and teach until the day he was taken up into heaven. Before this, with the help of the Holy Spirit, Jesus told the apostles he had chosen what they should do. After his death, he showed himself to them and proved in many ways that he was alive. The apostles saw Jesus during the forty days after he was raised from the dead, and he spoke to them about the kingdom of God.