Mark 12:27

(ubi sup.) Or else; because after proving that the soul remained after death, (for God could not be God of those who did not exist at all,) the resurrection of the body also might be inferred as a consequence, since it had done good and evil with the soul.

In another way also they are deceived, not understanding the Scriptures; for if they had understood them, they should also have understood how by the Scriptures the resurrection of the dead may be proved; wherefore He adds, And as touching the dead, that they rise, have ye not read in the book of Moses, how in the bush God spake unto him, saying, I am the God of Abraham, and the God of Isaac, and the God of Jacob? But I say, I am the God of Abraham, the God of Isaac, and the God of Jacob. As if He had said, The God of the living, wherefore He adds, He is not the God of the dead, but of the living; for He did not say, I have been, but I am, as if they had been present. But some one perhaps will say, that God spake this only of the soul of Abraham, not of his body; to which I answer, that Abraham implies both, that is, soul and body, so that He also is the God of the body, and the body lives with God, that is, in God's ordinance.

But when He says, The God of Abraham, the God of Isaac, and the God of Jacob; by naming God thrice, He implied the Trinity. But when He says, He is not the God of the dead, by naming again the One God, he implies One Substance. But they live who make good the portion, which they had chosen; and they are dead, who have lost what they had made good. Ye therefore do greatly err.