When does regeneration occur according to scriptures, and how do you prove that's what it is talking about?

Regeneration from the greek: palin genesia (palingenesis) when applied to a person, ( Titus 3: 5) is to go back to the original nature that God created in Adam at his "genesis" or creation. Its defined as a literal rebirth of the human spirit by replacing the old one with and entirely new human spirit. (REBIRTH, not a renewing) This is done by the Holy Spirit : John 3: 6 I refer you to Rom 2:29 and 7:6 and Ezekiel 11: 19 as proof text. who can give the accurate and clear scripture reference to this question of " when does it occur" and show the reasoning for it? HINT: there are about 35 names, titles and metaphors for the simple concept of : "spirit rebirth" in the New Testament, and some come from the Old Testament.