Acts 1:1-5
New Revised Standard Version (NRSV)

The Promise of the Holy Spirit
1 In the first book, Theophilus, I wrote about all that Jesus did and taught from the beginning 2 until the day when he was taken up to heaven, after giving instructions through the Holy Spirit to the apostles whom he had chosen. 3 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. 4 While staying with them, he ordered them not to leave Jerusalem, but to wait there for the promise of the Father. “This,” he said, “is what you have heard from me; 5 for John baptized with water, but you will be baptized with the Holy Spirit not many days from now.”