Acts 1:11

Overview - Acts 1
1	Christ, preparing his apostles to the beholding of his ascension, gathers them together unto the mount Olivet, commands them to expect in Jerusalem the sending down of the Holy Ghost, promises after a few days to send it, and ascends into heaven in their sight.
10	After his ascension they are warned by two angels to depart, and to set their minds upon his second coming.
12	They accordingly return, and, giving themselves to prayer, choose Matthias apostle in the place of Judas.

Acts 1:11  (King James Version)
Which also said, Ye men of Galilee, why stand ye gazing up into heaven? this same Jesus, which is taken up from you into heaven, shall so come in like manner as ye have seen him go into heaven.