Eating from any Clay is Unlawful Except the Clay of the Grave of Ĥusain, For Verily It Is the Cure — Hadith 3

3. Abū ‘Abdillāh Muḥammad ibn Aḥmad ibn Ya’qūb narrated to me from ‘Ali ibn Ḥasan ibn ‘Ali ibn Faďďāl, from his father, from some of our companions, who said: Abū Ja’far (Imam Bāqir (a. s. )) or Abū ‘Abdillāh (Imam Sādiq (a. s. )) said: Verily Allāh, the Blessed and the Exalted, created Ādam from clay. Therefore, He forbade (eating) clay on the children of Ādam (mankind). I asked, “What about (eating some of) the clay of the grave of Ḥusain (a. s. )? ” Imam (a. s. ) replied, “It is unlawful for people to eat their own flesh but is it permissible for them to eat our flesh? ! ! ! It is permissible to eat a very little amount from it, as much as a chick-pea. ”