In the first book, Theophilus, I wrote about all that Jesus did and taught from the beginning
until the day when he was taken up to heaven, after giving instructions through the Holy Spirit to the apostles whom he had chosen.
After his suffering he presented himself alive to them by many convincing proofs, appearing to them during forty days and speaking about the kingdom of God.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved. (New Revised Standard Bible Version Online)