John 3:12 (New International Version)
New International Version (NIV)
Copyright © 1973, 1978, 1984 by International Bible Society
12I have spoken to you of earthly things and you do not believe; how then will you believe if I speak of heavenly things?
I looked at the chapter, and it seems to be an admonishment not to take "rebirth" literally, but to seek the meaning behind the poetry.