Adam and the New Earth

Those in the new earth still need renewal of their bodies since the body is still flesh and has weaknesses, though there is no sin. This is why those outside the new city go into the new city receive of the tree of life for renewal.

This implies that Adam also had the same condition and was to die not because of sin but weakeness of the flesh, that is, not the sin of flesh or self of the soul, but the soft outer corpereal part that ages naturally.

What sin does is accelerate this process. This is why we say sin leads to death for a person leaves their body before their appointed time.