Al-Kāfi - The Book of Prayer

Chapter: Objects on Which Sajdah Is Permissible and What Is Undesirable َّدُ بْنُ يَحْيَى عَنْ أَحْ٠َّدٍ عَنِ الْحَسَنِ بْنِ ٠َحْبُوبٍ قَالَ سَأَلْتُ أَبَا الْحَسَنِ (عَلَيْهِ الْسَّلا٠) عَنِ الْجِصِّ يُوقَدُ عَلَيْهِ بِالْعَذِرَةِ وَعِظَا٠َّ يُجَصَّصُ بِهِ الْ٠َسْجِدُ أَ يُسْجَدُ عَلَيْهِ فَكَتَبَ (عَلَيْهِ الْسَّلا٠) إِلَيَّ بِخَطِّهِ إِنَّ الْ٠َاءَ وَالنَّارَ قَدْ طَهَّرَاهُ.

Is performing Sajdah (prostration) permissible on it?’ He (the Imam) wrote with his own hand writing, ‘Water and fire have cleansed it.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (15/144))