Acts 1:1-3

Dear Theophilus: In my first book I wrote about all the things that Jesus did and taught from the time he began his work until the day he was taken up to heaven. Before he was taken up, he gave instructions by the power of the Holy Spirit to the men he had chosen as his apostles. For forty days after his death he appeared to them many times in ways that proved beyond doubt that he was alive. They saw him, and he talked with them about the Kingdom of God.