"No one has ever gone into heaven except the one who came from heaven--the Son of Man." (John 3:13) Well known biblical unitarian Anthony Buzzard has an interpretation of John 3:13, and it is likely accurate. He says (in a youtube video called "John 3:13 Explained - "no man has ascended"?? - Anthony Buzzard & J. Dan Gill - Bible Commentary", which I'll link below) that the context in John is spiritual understanding (verse 12) and that nobody has ever reached the level of intimacy with heaven to the same degree that the man Jesus Christ has. Nobody's bridged the gap between heaven and earth or God and man like the one who came down from heaven has. He says this is poetic and typological language. This view is lent significant merit in Proverbs where the writer is, as Anthony puts it, "deploring the fact that he hasn't learned wisdom or gotten the knowledge he should have of the Holy One." "Who has ascended to heaven and com...