Acts 1:1-8
"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, 'You heard from me, for John indeed baptized with water; but you shall be baptized in the Holy Spirit not many days hence'.
They therefore, when they were come together, asked him, saying, 'Lord, will you at this time restore the kingdom to Israel?' And he said unto them, 'It is not for you to know times or seasons, which the Father has placed in His own authority. But you shall receive power when the Holy Spirit comes upon you, and you shall be my witnesses, both in Jerusalem, and in all Judaea and Samaria, and unto the uttermost part of the Earth'."