Verily, verily, I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness.
If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things?
And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.
And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up: That whosoever believeth in him should not perish, but have eternal life.For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. For God sent not his Son into the world to condemn the world; but that the world through him might be saved. He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
John 3: 11-18