Acts of the Apostles 1:10-11, 9

As they strained to see him rising into heaven, two white-robed men suddenly stood among them. “Men of Galilee,” they said, “why are you standing here staring into heaven? Jesus has been taken from you into heaven, but someday he will return from heaven in the same way you saw him go!”

After saying this, he was taken up into a cloud while they were watching, and they could no longer see him.