ذِكْرُ الْإِخْبَارِ بِأَنَّ النَّاسَ يُبْلَوْنَ فِي قُبُورِهُمْ إِلَّا عَجْبَ الذَّنَبِ مِنْهُمْ
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). (Using translation from Muslim 2955b)
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «كُلُّ ابْنِ آدَمَ يَأْكُلُهُ التُّرَابُ إِلَّا عَجْبَ الذَّنَبِ مِنْهُ خُلِقَ وَفِيهِ يُرَكَّبُ»