Al-Kāfi

Hadith 749
burial
10ـ حُمَيْدُ بْنُ زِيَادٍ عَنِ الْحَسَنِ بْنِ مُحَمَّدِ بْنِ سَمَاعَةَ عَنْ بَعْضِ أَصْحَابِهِ عَنْ أَبَانٍ عَنْ عَبْدِ الرَّحْمَنِ بْنِ سَيَابَةَ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ سُلَّ الْمَيِّتَ سَلاًّ.
10. Humayd ibn Ziyad has narrated from al-Hassan ibn Muhammad ibn Sama‘ah from certain individuals of his people from Aban from ‘Abd al- Rahman ibn Sayabah from abu ‘Abd Allah, who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘You should place the deceased in the grave gently.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī