Muhammad ibn Ahmad from Ahmad ibn al-Hasan from Amr ibn Sa'id from Musaddiq ibn Sadaqah from Ammar from Abu Abdillah عليه السلام, peace be upon him, who said: I asked Imam al-Sadiq عليه السلام about the sick person, whether it is permissible for him to stand on his bed and prostrate on the ground? Imam عليه السلام said: “If the bed is thick to the extent of a brick (ajurrah) or less, then it is correct for him to stand on it and prostrate on the ground. But if it is more than that, then no.”