Taken Alive to Heaven

Enoch (Gen. 5:24) is the first one who comes to mind. Jesus was also taken up to heaven without dying, though he did die and rise prior to his ascension into heaven. Paul was also taken into heaven for a vision (2 Cor. 12), after which he came back to earth. Later, of course, he died and returned to heaven. If we include angels, all the angels who came to earth as God's messenger's and helpers also returned to heaven without dying.