Acts 1:1-3 Revised Standard Version (RSV)
The Promise of the Holy Spirit
1 In the first book, O The-oph′ilus, I have dealt with all that Jesus began to do and teach, 2 until the day when he was taken up, after he had given commandment through the Holy Spirit to the apostles whom he had chosen. 3 To them he presented himself alive after his passion by many proofs, appearing to them during forty days, and speaking of the kingdom of God.
Acts 1:1-3 New International Version (NIV)
Jesus Taken Up Into Heaven
1 In my former book, Theophilus, I wrote about all that Jesus began to do and to teach 2 until the day he was taken up to heaven, after giving instructions through the Holy Spirit to the apostles he had chosen. 3 After his suffering, he presented himself to them and gave many convincing proofs that he was alive. He appeared to them over a period of forty days and spoke about the kingdom of God.