I am unfamiliar with this notion. Where does it come from?
The Bible. For starters, Ezekiel 18:4 Behold, all souls are Mine; as the soul of the father, so also the soul of the son is Mine: the soul that sinneth, it shall die.
It is impossible to own something that does not already exist. The only reference to 'flesh' is the biological process of conception. I could spend hours quoting Scripture that demonstrates this flesh age is but for a singular purpose of giving the souls/spirits of that heaven and earth world (age) that was, of their own free will to take this flesh journey.
Paul says some were predestinated before the foundation of this world (age) meaning the casting down - overthrow of that first rebel. It is impossible to predestine something that did not already exist.