John 3:2, 13

who came to Jesus at night and said to Him, “Rabbi (Teacher), we know [without any doubt] that You have come from God as a teacher; for no one can do these signs [these wonders, these attesting miracles] that You do unless God is with him.”

No one has gone up into heaven, but there is One who came down from heaven, the Son of Man [Himself—whose home is in heaven].