What Can and Cannot Be Used for Prostration
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 41
وَ سَأَلَ رَجُلٌ اَلصَّادِقَ عَلَيْهِ اَلسَّلاَمُ: عَنِ اَلْمَكَانِ يَكُونُ فِيهِ اَلْغُبَارُ فَأَنْفُخُهُ إِذَا أَرَدْتُ اَلسُّجُودَ فَقَالَ «لاَ بَأْسَ.
A man asked Imam Jafar ibn Muhammad Al-Sadiq عليه السلام about a place with dust where he wanted to blow it away before prostrating. The Imam said: "There is no issue”.
- Ṣaḥīḥ al-Faqīh