The Book Pertaining to the Turmoil and Portents of the Last Hour (Kitab Al-Fitan wa Ashrat As-Sa`ah)
Muslim :: Book 41 : Hadith 6948
Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: By Him, in Whose hand is my life, the world would not come to an end until a person would pass by a grave, would roll over it and express the desire that he should be in the place of the occupant of that grave not because of religious reasons but because of this calamity.