John 3:11-13 NIV

[11] Very truly I tell you, we speak of what we know, and we testify to what we have seen, but still you people do not accept our testimony. [12] I have spoken to you of earthly things and you do not believe; how then will you believe if I speak of heavenly things? [13] No one has ever gone into heaven except the one who came from heaven—the Son of Man.