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)
عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ كُلُّ ابْنِ آدَمَ يَبْلَى وَيَأْكُلُهُ التُّرَابُ إِلَّا عَجْبَ الذَّنَبِ مِنْهُ خُلِقَ وَفِيهِ يُرَكَّبُ