Acts 1:1-5 - The Preface
1 The former treatise, O Theophilus, I made concerning all that Jesus undertook both to do and to teach; 2 till the day in which He was taken up, after He had by the holy Spirit given instructions to the apostles whom He had chosen: 3 to whom also He presented Himself alive, after He had suffered, by many certain proofs; being seen among them for forty days, and speaking of the things relating to the kingdom of God.
4 And meeting them together He commanded them not to depart from Jerusalem, but to wait for the promise of the Father, which, said He, ye have heard from me; 5 for John indeed baptized with water, but ye shall within a few days be baptized with the holy Spirit.