Regeneration of the human spirit is a cornerstone doctrine of the New Testament, taught in Jesus’ famous ‘born again’ discourse with Nicodemus. (John 3) Likewise, St. Paul explains our restoration in scriptures such as Colossians 3:9-10.
“You have put off the old self with its practices and have put on the new self, which is being renewed in knowledge after the image of its creator.”
Given that New Testament revelation finds its fountainhead in the Old Testament, was this experience explicitly promised by the prophets? And where in the Old Testament is the source of the doctrine of Regeneration?