Acts 1:2-8

2 "Until the day in which he was taken up, after that he through the Holy Ghost had given commandments unto the apostles whom he had chosen:"
3 "To whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and speaking of the things pertaining to the kingdom of God:"
4 "And, being assembled together with them, commanded them that they should not depart from Jerusalem, but wait for the promise of the Father, which, saith he, ye have heard of me."
5 "For John truly baptized with water; but ye shall be baptized with the Holy Ghost not many days hence."
6 "When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel?"
7 "And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power."
8 "But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth."