Matthew 22:31

Verses 31,32. As touching, etc. That is, in proof that the dead are raised. The passage which he quotes is recorded in Ex 3:6,15. This was at the burning bush, (Mark and Luke.) Abraham, Isaac, and Jacob had been long dead when Moses spoke this: Abraham 329 years, Isaac 224, and Jacob 198. Yet God spoke then as being still their God. They must, therefore, be still somewhere living; for God is not the God of the dead--i. e., it is absurd to say that God rules over those who are extinct or annihilated--but he is the God only of those who have an existence. Luke adds, "All live unto him." That is, all the righteous dead; all of whom he can be properly called their God, live unto his glory.