The Acts 1:3-5

To whom he also shewed 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 with the Holy Ghost not many days hence.