Acts 1:1-5 - The Preface
1 Truly, O Theophilus, I made the first report as to all things that Jesus began both to do and teach 2 until the day He was taken up, having given directions to the apostles whom He chose, through the Holy Spirit; 3 to whom He also presented Himself living after His suffering by many infallible proofs, being seen by them through forty days, and speaking of the things pertaining to the kingdom of God.
4 And having met with them, He commanded them not to depart from Jerusalem, but to await the promise of the Father which you heard from Me. 5 For John truly baptized with water, but you shall be baptized in the Holy Spirit not many days from now.