Al-Kāfi

Hadith 259
ghusl
5ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ خَالِدٍ عَنِ الْحُسَيْنِ بْنِ سَعِيدٍ عَنِ الْقَاسِمِ بْنِ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ أَبِي حَمْزَةَ عَنْ أَبِي بَصِيرٍ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلام) عَنِ الْمَذْيِ يُصِيبُ الثَّوْبَ قَالَ لَيْسَ بِهِ بَأْسٌ.
5. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn Khalid from al-Husayn ibn Sa‘id from al-Qasim ibn Muhammad from Ali ibn abu Hamzah from abu Basir who has said the following: “I once asked abu ‘Abd Allah (a.s.), about al-Madhiy (the pre-seminal fluid) which pollutes one’s clothes. He (the Imam) said, ‘It is not harmful.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī