Water; Its Purity and Impurity
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 2
وَ سُئِلَ عَلَيْهِ اَلسَّلاَمُ: عَنْ طِينِ اَلْمَطَرِ يُصِيبُ اَلثَّوْبَ فِيهِ اَلْبَوْلُ وَ اَلْعَذِرَةُ وَ اَلدَّمُ فَقَالَ «طِينُ اَلْمَطَرِ لاَ يُنَجِّسُ.
Imam Jafar ibn Muhammad Al-Sadiq عليه السلام was asked about rain-soaked mud that gets on clothes, which may contain urine, feces, and blood. Imam عليه السلام said: "Rain-soaked mud does not make (the clothes) impure”.
- Ṣaḥīḥ al-Faqīh