Theophylact of Bulgaria
In another way, the Sadducees lack understanding of the Scriptures. Had they truly comprehended them, they would grasp the meaning of the phrase, “I am the God of Abraham, Isaac, and Jacob," which indicates the living. The Lord did not express, “I was,” but rather “I am” their God, emphasizing their ongoing existence rather than their extinction. Some may argue that the Lord's words pertain solely to the souls of the patriarchs and not to their bodies, thus claiming we cannot infer the Resurrection of the bodies from this. In response, I assert that when mentioning Abraham, it encompasses both soul and body, for God is the God of the body as well, which remains alive before Him and has not been reduced to oblivion.
Read more (71 words)
Furthermore, since the Sadducees did not accept the resurrection of bodies, the Lord spoke of bodies being alive with God, not merely of souls, which the Sadducees acknowledged. It is important to recognize that resurrection signifies the rising of what has fallen, specifically our bodies returning to dust. The soul, being immortal, does not experience this fall, but the body does; therefore, it will rise again when united with the soul.