Al-Lu'lu Wal-Marjan 1864 — The Book of Al-Fitn (Trials and Afflictions etc.) and the Portents of the Hour

Al-A`mash Narrated from:

Abû Huraira رضي الله عنه said, "Allâh's Messenger صلى الله عليه وسلم said, 'Between the two blowings of the Trumpet, there will be forty.' " Somebody asked Abû Huraira, "Forty days." But he refused to reply. Then he asked, "Forty months?" He refused to reply. Then he asked, "Forty years?" Again, he refused to reply.Abû Huraira added, "Then (after this period) Allâh تعالى will send water from the sky and then the dead bodies will grow like vegetation grows, there is nothing of the human body that does not waste away or perish except one bone; that is the little bone at the end of the coccyx of which the human body will be recreated on the Day of Resurrection." ( Sahîh Al-Bukhâri, Hadîth No. 457, Vol. 6)