The Early Church Fathers on various topics: This was a 3700 hour project which included going through 22896 pages of the 38 volume set called Ante Nicene, Nicene, Post Nicene Fathers. I compiled 255 pages of quotes showing that the Early Church was always and completely Catholic. All of these quotes can be verified and found from the source which is free online.
For both are revealed to the world as but one, for the soul was not anterior to the body in its essence; nor, in regard to its formation, did the body precede the soul: but both these were produced at one time; and their nourishment consists in purity and sweetness
Hyppolytus Against Plato, On the Cause of the Universe par 2 (170-236 ad)
and then He will accomplish a resurrection of all, not by transferring souls into other bodies, but by raising the bodies themselves.
Jerome Letter 144 par 5 (347-420 ad)
For it is impossible that you should hold the opinion of Origen, Priscillian, and other heretics that it is for deeds done in a former life that souls are confined in earthly and mortal bodies. This opinion is, indeed, flatly contradicted by the apostle who says of Jacob and Esau that before they were born they had done neither good nor evil.