What Can and Cannot Be Used for Prostration
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 41
وَ سَأَلَ دَاوُدُ بْنُ أَبِي زَيْدٍ أَبَا اَلْحَسَنِ اَلثَّالِثَ عَلَيْهِ اَلسَّلاَمُ: عَنِ اَلْقَرَاطِيسِ وَ اَلْكَوَاغِذِ اَلْمَكْتُوبَةِ عَلَيْهَا هَلْ يَجُوزُ عَلَيْهَا اَلسُّجُودُ فَكَتَبَ «يَجُوزُ.
Dawud ibn Abi Zayd asked Imam Abu al-Hasan al-Thalith عليه السلام about prostrating on papers and documents with writing on them. The Imam wrote back: "It is permissible."
- Ṣaḥīḥ al-Faqīh