27 There came to him some Sadducees, those who say that there is no resurrection, 28 and they asked him a question, saying, "Teacher, Moses wrote for us that if a man's brother dies, having a wife but no children, the man must take the wife and raise up children for his brother. 29 Now there were seven brothers; the first took a wife, and died without children; 30 and the second 31 and the third took her, and likewise all seven left no children and died. 32 Afterward the woman also died. 33 In the resurrection, therefore, whose wife will the woman be? For the seven had her as wife."
34 And Jesus said to them, "The sons of this age marry and are given in marriage; 35 but those who are accounted worthy to attain to that age and to the resurrection from the dead neither marry nor are given in marriage, 36 for they cannot die any more, because they are equal to angels and are sons of God, being sons of the resurrection. 37 But that the dead are raised, even Moses showed, in the passage about the bush, where he calls the Lord the God of Abraham and the God of Isaac and the God of Jacob. 38 Now he is not God of the dead, but of the living; for all live to him." 39 And some of the scribes answered, "Teacher, you have spoken well." 40 For they no longer dared to ask him any question.
Daily Quote from the early church fathers:
Jesus cites Moses to affirm the resurrection, by Cyril of Alexandria (376-444 AD)
"The Savior also demonstrated the great ignorance of the Sadducees by bringing forward their own leader Moses, who was clearly acquainted with the resurrection of the dead. He set God before us saying in the bush, 'I am the God of Abraham, and the God of Isaac and the God of Jacob' (Exodus 3:6). Of whom is he God, if, according to their argument, these have ceased to live? He is the God of the living. They certainly will rise when his almighty right hand brings them and all that are on the earth there. For people not to believe that this will happen is worthy perhaps of the ignorance of the Sadducees, but it is altogether unworthy of those who love Christ. We believe in him who says, 'I am the resurrection and the life' (John 11:25). He will raise the dead suddenly, in the twinkling of an eye, and at the last trumpet. It shall sound, the dead in Christ shall rise incorruptible, and we shall be changed (1 Corinthians 15:52). For Christ our common Savior will transfer us into incorruption, glory and to an incorruptible life." (excerpt from COMMENTARY ON LUKE, HOMILY 136)