“But you shall receive power when the Holy Spirit has come upon you; and you shall be My witnesses in Jerusalem and in all Judea and Samaria and to the end of the earth.” And when He had said this, as they were looking on, He was lifted up, and a cloud took Him out of their sight. And while they were gazing into Heaven as He went, behold, two men stood by them in white robes, and said, “Men of Galilee, why do you stand looking into Heaven? This Jesus, Who was taken up from you into Heaven, will come in the same way as you saw Him go into Heaven.”   --  Acts of the Apostles, 1:8-11