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).
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ كُلُّ ابْنِ آدَمَ يَأْكُلُهُ التُّرَابُ إِلاَّ عَجْبَ الذَّنَبِ مِنْهُ خُلِقَ وَفِيهِ يُرَكَّبُ