Water; Its Purity and Impurity
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 2
وَ سَأَلَهُ عَنِ اَلرَّجُلِ يَمُرُّ فِي مَاءِ اَلْمَطَرِ وَ قَدْ صُبَّ فِيهِ خَمْرٌ فَأَصَابَ ثَوْبَهُ هَلْ يُصَلِّي فِيهِ قَبْلَ أَنْ يَغْسِلَهُ فَقَالَ «لاَ يَغْسِلُ ثَوْبَهُ وَ لاَ رِجْلَهُ وَ يُصَلِّي فِيهِ وَ لاَ بَأْسَ بِهِ.
Ali ibn Ja'far asked Imam Musa ibn Jafar Al-Kadhim عليه السلام was asked about a man who walks through rainwater into which wine has been poured in and it gets on his clothes. Should he wash it before praying in those clothes? Imam عليه السلام said: "He does not need to wash his clothes or his feet, and he may pray in them, and there is no harm in it."
- Ṣaḥīḥ al-Faqīh