Sahih Muslim Book - 52, Hadith - 7414

حَدَّثَنَا أَبُو كُرَيْبٍ مُحَمَّدُ بْنُ الْعَلاَءِ حَدَّثَنَا أَبُو مُعَاوِيَةَ عَنِ الأَعْمَشِ عَنْ أَبِى صَالِحٍ عَنْ أَبِى هُرَيْرَةَ قَالَ قَالَ رَسُولُ اللَّهِ -صلى الله عليه وسلم- « مَا بَيْنَ النَّفْخَتَيْنِ أَرْبَعُونَ ». قَالُوا يَا أَبَا هُرَيْرَةَ أَرْبَعُونَ يَوْمًا قَالَ أَبَيْتُ. قَالُوا أَرْبَعُونَ شَهْرًا قَالَ أَبَيْتُ. قَالُوا أَرْبَعُونَ سَنَةً قَالَ أَبَيْتُ « ثُمَّ يُنْزِلُ اللَّهُ مِنَ السَّمَاءِ مَاءً فَيَنْبُتُونَ كَمَا يَنْبُتُ الْبَقْلُ ». قَالَ « وَلَيْسَ مِنَ الإِنْسَانِ شَىْءٌ إِلاَّ يَبْلَى إِلاَّ عَظْمًا وَاحِدًا وَهُوَ عَجْبُ الذَّنَبِ وَمِنْهُ يُرَكَّبُ الْخَلْقُ يَوْمَ الْقِيَامَةِ ».

It was narrated that Abu Hurairah said: "The Messenger of Allah (s.a.w) said: 'Between the two Trumpet blasts there will be forty."' They said: "O Abu Hurairah, forty days?" He said: "I cannot say." They said: "Forty months?" He said: "I cannot say." They said: "Forty years?" He said: "I cannot say. 'Then Allah will send down water from the sky, and they will grow as herbs grow."' He said: "There is no part of man that will not decay, except a single bone which is the tailbone. From it he will be recreated on the Day of Resurrection."