John 3:11-13
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11Verily, verily, I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness. 12If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things? 13And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.
John 3:11-13 (KJV)