Acts 1:1-5

The former treatise I made, O Theophilus, concerning all that Jesus began both to do and to teach, until the day in which he was received up, after that he had given commandment through the Holy Spirit unto the apostles whom he had chosen: to whom he also showed himself alive after his passion by many proofs, appearing unto them by the space of forty days, and speaking the things concerning the kingdom of God: and, being assembled together with them, he charged them not to depart from Jerusalem, but to wait for the promise of the Father, which, said he, ye heard from me: for John indeed baptized with water; but ye shall be baptized in the Holy Spirit not many days hence.