Now, just as the term resurrection is predicated of that which falls—that is, the flesh—so will there be the same application of the word dead, because what is called “the resurrection of the dead” indicates the rising up again of that which is fallen down. We learn this from the case of Abraham, the father of the faithful, a man who enjoyed close intercourse with God. For when he requested of the sons of Heth a spot to bury Sarah in, he said to them, “Give me the possession of a burying place with you, that I may bury my dead,”—meaning, of course, her flesh; for he could not have desired a place to bury her soul in, even if the soul is to be deemed mortal, and even if it could bear to be described by the word “dead.” Since, then, this word indicates the body, it follows that when “the resurrection of the dead” is spoken of, it is the rising again of men’s bodies that is meant.
Tertullian
On the Resurrection of the Flesh
Chapter XVIII