Yahya related to me from Malik from Abu'z Zinad from al-Araj fromAbu Hurayra that the Messenger of Allah, may Allah bless him and granthim peace, said, "The earth eats all of the son of Adam except thecoccyx. He was created from it, and on it he is built."
USC-MSA web (English) reference: Book 16, Hadith 49
Arabic reference: Book 16, Hadith 571