Acts 1:1-5 - The Preface
1 I produced the former account, O Theophilus, about all {that} Jesus began to do and to teach, 2 until the day he was taken up, [after he] had given orders through the Holy Spirit to the apostles whom he had chosen, 3 to whom he also presented himself alive after he suffered, with many convincing proofs, appearing to them over a period of forty days and speaking the things about the kingdom of God.
4 And [while he] was with [them], he commanded them, "Do not depart from Jerusalem, but wait for what was promised by the Father, which you heard about from me. 5 For John baptized with water, but you will be baptized with the Holy Spirit {not many days from now}."