Hadith.580 - It was narrated from Ammar al-Sabati that He said: Imam Jafar ibn Muhammad Al-Sadiq (as) was asked whether the body of the deceased decays.
Imam (as) said
"Yes, until there remains no flesh or bones except for the original clay from which he was created. It does not decay but remains in the grave, encircling itself, until he is recreated from it just as he was created the first time."