Acts of the Apostles, Chapter 1,  verses 3, 9

¹ Christ preparing his apostles to the beholding of his ascension, gathereth them together into the mount Olivet, commandeth to expect in Jerusalem the sending-down of the holy Ghost, promiseth after few days to send it, by virtue whereof they should be witnesses unto hem even to the utmost parts of the earth, ⁹ After his ascension they are warned by two angels to depart, and to set their minds upon his second coming