Mark 12:26
Now about the dead rising — have you not read in the book of Moses, in the account of the burning bush, how God said to him, I am the God of Abraham, the God of Isaac, and the God of Jacob? — the Pentateuchal argument for resurrection is drawn from Exodus 3:6, the text the Sadducees themselves accept as authoritative. The present tense of the divine self-identification is the key: I am (not I was) the God of Abraham, Isaac, and Jacob — spoken centuries after their deaths.