What Defiles Clothing and the Body
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 17
وَ سَأَلَ عَبْدُ اَللَّهِ بْنُ بُكَيْرٍ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ: عَنِ اَلرَّجُلِ يَلْبَسُ اَلثَّوْبَ وَ فِيهِ اَلْجَنَابَةُ فَيَعْرَقُ فِيهِ فَقَالَ «إِنَّ اَلثَّوْبَ لاَ يُجْنِبُ اَلرَّجُلَ.
Abdullah ibn Bakir asked Imam Jafar ibn Muhammad Al-Sadiq عليه السلام about a man who wears a garment with janabah (ritual impurity from sexual activity) and sweats in it. Imam عليه السلام said: 'The garment does not make the man ritually impure.'.
- Ṣaḥīḥ al-Faqīh, p. 25