The witness from above:
Related Commentaries of John 3:9
John 3:9-13
9 Nicodemus answered and said unto him, How can these things be?
10 Jesus answered and said unto him,Art thou a master of Israel, and knowest not these things?
11 Verily, verily, I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness.
12 If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things?
13 And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.