The Book of Funerals
21/117. Chapter:
The Souls of The Believers
Sunan an-Nasai
أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، وَمُغِيرَةَ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " كُلُّ بَنِي آدَمَ - وَفِي حَدِيثِ مُغِيرَةَ كُلُّ ابْنِ آدَمَ - يَأْكُلُهُ التُّرَابُ إِلاَّ عَجْبَ الذَّنَبِ مِنْهُ خُلِقَ وَفِيهِ يُرَكَّبُ " .
It was narrated that Abu Hurairah said: "The Messenger of Allah said: 'The Messenger of Allah said: 'The whole of the son of Adam will be consumed by the earth, except for the tailbone, from which he was created and from which he will be created anwe."'
Reference : Sunan an-Nasa'i 2077In-book reference : Book 21, Hadith 260English translation : Vol. 3, Book 21, Hadith 2079