Luke 20:37-38 (NKJV)
But even Moses showed in the burning bush passage that the dead are raised, when he called the Lord 'the God of Abraham, the God of Isaac, and the God of Jacob.' For He is not the God of the dead but of the living, for all live to Him."
Jesus was talking to the Sadducees who did not believe in the resurrection of the dead because they could not find it in the Law of Moses. The interesting thing about the resurrection is that not only will they be resurrected who will spend eternity with God in Heaven but also those who will spend eternity apart from God because of their choice to reject Him. Some people may think that they can just crawl into the grave and pull the dirt up over them to escape this world. No, we are eternal beings whether you want to be or not! You will spend somewhere in eternity. Do you know where you will be?
John 5:28-29 (NKJV)
Do not marvel at this; for the hour is coming in which all who are in the graves will hear His voice and come forth-- those who have done good, to the resurrection of life, and those who have done evil, to the resurrection of condemnation.