Yet, YOU were the one who added the word "again" - claiming Jerome said it so it was okay. Here's your comment along with the usual snide aside we've come to expect:
Jesus answered, and said to him: Amen, amen I say to thee, unless a man be born again, he cannot see the kingdom of God. [4] Nicodemus saith to him: How can a man be born when he is old? can he enter a second time into his mother' s womb, and be born again? [5] Jesus answered: Amen, amen I say to thee, unless a man be born again of water and the Holy Ghost, he cannot enter into the kingdom of God. (John 3)
Have you forgotten that THAT was the point being argued? Jesus had to have been speaking of born of water - meaning the "flesh gives birth to flesh" - as a physical human birth, since He said so the very next verse, and NOT your erroneous insistence that He said "born again of water". If this is your way a conceding you were wrong, I accept.
The second “again” whether it is supposed to be there or not, does not do anything to the meaning. The second birth is by the water and spirit and this is how everyone understood it, prior to the Protestant charlatans, according to the evidence in the Acts.