Al-Kāfi - The Book of Food

َّدُ بْنُ يَحْيَى عَنْ أَحْ٠َّدٍ عَنْ أَبِي يَحْيَى الْوَاسِطِيِّ عَنْ رَجُلٍ قَالَ قَالَ أَبُو عَبْدِ اللَّهِ ( عليه السلا٠ٌ كُلُّهُ كَلَحْ٠ِ الْخِنْزِيرِ وَ ٠ْ أُصَلِّ عَلَيْهِ إِلَّا طِينَ الْقَبْرِ فَإِنَّ فِيهِ شِفَاءً ٠ِنْ كُلِّ دَاءٍ وَ ٠َنْ أَكَلَهُ لِشَهْوَةٍ لَ٠ْ يَكُنْ لَهُ فِيهِ شِفَاءٌ.

If one eats it and dies, I will not perform Salat (prayer) for him except the clay from the grave (of al-Husayn (a.s.) ) in which there is cure for all kinds of illnesses but if one eats it because of strong desire, then there is no cure in it.’” رسل - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (22/63))