Al-Kāfi

Hadith 811
funeral-prayer
4ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ أَيُّوبَ بْنِ نُوحٍ رَفَعَهُ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ إِذَا قُطِعَ مِنَ الرَّجُلِ قِطْعَةٌ فَهُوَ مَيْتَةٌ وَإِذَا مَسَّهُ الرَّجُلُ فَكُلُّ مَا كَانَ فِيهِ عَظْمٌ فَقَدْ وَجَبَ عَلَى مَنْ مَسَّهُ الْغُسْلُ وَإِنْ لَمْ يَكُنْ فِيهِ عَظْمٌ فَلاَ غُسْلَ عَلَيْهِ.
4. A number of our people have narrated from Sahl ibn Ziyad from Ayyub ibn Nuh in a marfu‘ manner who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘If a piece is cut from a man, it is dead. In case of one’s touching, whatever piece has bone in it Ghusl (bath) becomes obligatory, if bone is not found in it, Ghusl (bath) is not obligatory.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī