Water; Its Purity and Impurity
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 2
وَ سَأَلَ عَمَّارٌ اَلسَّابَاطِيُّ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ عَنِ اَلْقَيْءِ يُصِيبُ اَلثَّوْبَ فَلاَ يُغْسَلُ فَقَالَ «لاَ بَأْسَ بِهِ.
Ammar al-Sabati asked Imam Jafar ibn Muhammad Al-Sadiq عليه السلام about vomit that gets on clothing and is not washed off. Imam عليه السلام said: "There is no harm in it."
- Ṣaḥīḥ al-Faqīh