كتاب الفتن وأشراط الساعة
54
The Book of Tribulations and Portents of the Last Hour
(28)
Chapter: Between The Blasts (Of The Trumpet)
(28)
باب مَا بَيْنَ النَّفْخَتَيْنِ
Sahih Muslim 2955 b

Abu Huraira reported Allah's Messenger (ﷺ) as saying:

The earth would consume all of the son of Adam except his tailbone. From it he was created, and from it he will be recreated (on the Day of Resurrection).
وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا الْمُغِيرَةُ، - يَعْنِي الْحِزَامِيَّ - عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ كُلُّ ابْنِ آدَمَ يَأْكُلُهُ التُّرَابُ إِلاَّ عَجْبَ الذَّنَبِ مِنْهُ خُلِقَ وَفِيهِ يُرَكَّبُ ‏"‏ ‏.‏
Reference : Sahih Muslim 2955 b
In-book reference : Book 54, Hadith 178
USC-MSA web (English) reference : Book 41, Hadith 7056
  (deprecated numbering scheme)