John 3:13
No one has ascended into heaven but he who descended out of heaven, the Son of Man, who is in heaven.
World English Bible (Public Domain)
In context
Before · John 3:11–12
11Most certainly I tell you, we speak that which we know and testify of that which we have seen, and you don’t receive our witness. 12If I told you earthly things and you don’t believe, how will you believe if I tell you heavenly things?
13No one has ascended into heaven but he who descended out of heaven, the Son of Man, who is in heaven.