Acts 1:1-5 - The Preface
1 Truly, I made the first history, O Theophilus, concerning all things which Jesus began both to do and to teach, 2 from the day on which, having given commandment through the Holy Ghost to the apostles whom He had chosen, He was received up. 3 To whom He also, after He suffered, manifested Himself alive in many testimonials, being seen by them forty days, and speaking the things concerning the kingdom of God:
4 and being assembled together with them, He commanded them, Not to depart from Jerusalem, but to await the promise of the Father which ye heard from me; 5 that John indeed baptized with water, but you shall be baptized with the Holy Ghost not many days hence.