Al-Kāfi

Hadith 235
ghusl
3ـ الْحُسَيْنُ بْنُ مُحَمَّدٍ عَنْ مُعَلَّى بْنِ مُحَمَّدٍ عَنِ الْوَشَّاءِ عَنْ أَبَانِ بْنِ عُثْمَانَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي عَبْدِ الله قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلام) عَنِ الْمَرْأَةِ تَغْتَسِلُ مِنَ الْجَنَابَةِ ثُمَّ تَرَى نُطْفَةَ الرَّجُلِ بَعْدَ ذَلِكَ هَلْ عَلَيْهَا غُسْلٌ فَقَالَ لاَ.
3. Al-Husayn ibn Muhammad has narrated from Mu‘alla’ ibn Muhammad from al-Washsha’ from Aban ibn ‘Uthman from ‘Abd al- Rahman ibn abu ‘Abd Allah who has said the following: “I once asked abu ‘Abd Allah (a.s.), about the case of a woman who takes Ghusl (bath) because of sexual relation; then she finds man’s semen after Ghusl (bath). He (the Imam) said, ‘No, Ghusl (bath) is not necessary again.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī