“And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.”
King James Version (KJV)
3:13 For no one - For here you must rely on my single testimony, whereas there you have a cloud of witnesses: Hath gone up to heaven, but he that came down from heaven. Who is in heaven - Therefore he is omnipresent; else he could not be in heaven and on earth at once. This is a plain instance of what is usually termed the communication of properties between the Divine and human nature; whereby what is proper to the Divine nature is spoken concerning the human, and what is proper to the human is, as here, spoken of the Divine.
Joh 3:13 And no man hath ascended, etc. This implies: (1) That he existed before he appeared on earth. (2) That heaven was his true abode. (3) That, on earth, his spirit was in communication with heaven.