Nicene and Post-Nicene Fathers, Vol. II:
On Christian Doctrine: Chapter 21

Chapter 21.—Neither Body Nor Soul Extinguished at Death.

And so faith clings to the assurance, and we must believe that it is so in fact, that neither the human soul nor the human body suffers complete extinction, but that the wicked rise again to endure inconceivable punishment, and the good to receive eternal life.