٣ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْحَسَنِ بْنِ مَحْبُوبٍ قَالَ سَأَلْتُ أَبَا الْحَسَنِ (عَلَيْهِ الْسَّلام) عَنِ الْجِصِّ يُوقَدُ عَلَيْهِ بِالْعَذِرَةِ وَعِظَامِ الْمَوْتَى ثُمَّ يُجَصَّصُ بِهِ الْمَسْجِدُ أَ يُسْجَدُ عَلَيْهِ فَكَتَبَ (عَلَيْهِ الْسَّلام) إِلَيَّ بِخَطِّهِ إِنَّ الْمَاءَ وَالنَّارَ قَدْ طَهَّرَاهُ.
3. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from al-Hassan ibn Mahbub who has said the following: “I once asked abu al-Hassan , about lime which is fired with feces (dung) and bones of dead animals, then is used in the construction of Masjid. Is performing Sajdah (prostration) permissible on it?’ He (the Imam) wrote with his own hand writing, ‘Water and fire have cleansed it.’” 