Sayyiduna Abu Razin (may Allah be pleased with him) said: I said: O Messenger of Allah! How will Allah bring the dead back to life? He (peace and blessings be upon him) said: "Have you never passed by the valley of your people when it was dry, then passed by it when it was green, then passed by it when it was dry, then passed by it when it was green? That is how Allah will bring the dead back to life."
Hadith Referenceالمعجم الكبير للطبراني / باب اللام / 16519