Al-Kāfi
Hadith 2573ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عُثْمَانَ بْنِ عِيسَى عَنْ سَمَاعَةَ قَالَ سَأَلْتُهُ عَنِ الْمَنِيِّ يُصِيبُ الثَّوْبَ قَالَ اغْسِلِ الثَّوْبَ كُلَّهُ إِذَا خَفِيَ عَلَيْكَ مَكَانُهُ قَلِيلاً كَانَ أَوْ كَثِيراً.
3. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ‘Uthman ibn ‘Isa from Sama‘ah who has said the following: “I once asked him (the Imam) (a.s.), about the case of semen that pollutes one’s clothes. He (the Imam) said, ‘You must wash all of your clothes when you do not know exactly the polluted spot, regardless, if it is a little or large area.’”