The Complete Pilgrimage Guide · Hadith 650 (#Ḥadīth #4)
Chapter 95 | Eating from any Clay is Unlawful Except the Clay of the Grave of Ĥusain , For Verily It Is the Cure
4 وَ رَوَى سَمَاعَةُ بْنُ مِهْرَانَ عَنْ أَبِي عَبْدِ اللَّهِ (ع) قَالَ كُلُّ طِينٍ حَرَامٌ عَلَى بَنِي آدَمَ مَا خَلَا طِينَ قَبْرِ الْحُسَيْنِ (ع) مَنْ أَكَلَهُ مِنْ وَجَعٍ شَفَاهُ اللَّهُ تَعَالَى
4. Samā’ah ibn Mihrān narrated that: Abū ‘Abdillāh (Imam Sādiq ) said: (Eating from) any clay is unlawful for mankind except (eating from) the clay of the grave of Ḥusain . Allāh, the Exalted, will cure those who eat from it to treat an illness.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).