Al-Kāfi - Volume 3 > Things Coming Out of a Dead Body after Ghusl (bath)
Hadith #2

2ـ عَنْهُ عَنْ بَعْضِ أَصْحَابِهِ رَفَعَهُ قَالَ إِذَا غُسِّلَ الْمَيِّتُ ثُمَّ أَحْدَثَ بَعْدَ الْغُسْلِ فَإِنَّهُ يُغْسَلُ الْحَدَثُ وَلاَ يُعَادُ الْغُسْلُ.

2. It is a narration from him (narrator of previous Hadith) by certain persons of his people in a marfu‘ manner who has said the following: “He (the Imam), ‘Alayhi al-Salam, has said, ‘After Ghusl (bath), if something happens, only that part is washed and repeating Ghusl (bath) is not required.’”