A.T. Robertson Commentary Luke 24:51

"And it came to pass, while he blessed them, he parted from them, and was carried up into heaven." — Luke 24:51 (ASV)

He parted from them (διεστη απ' αυτων). Second aorist active (intransitive) indicative of διιστημ. He stood apart (δια) and he was gone. Some manuscripts do not have the words "and was carried into heaven." But we know that Jesus was taken up into heaven on a cloud (Acts 1:9).