Al-Kāfi

Hadith 1011
sacrifice
2ـ أَبُو عَلِيٍّ الأَشْعَرِيُّ عَنْ مُحَمَّدِ بْنِ عَبْدِ الْجَبَّارِ عَنْ صَفْوَانَ عَنْ ذَرِيحٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) قَالَ الْحَجُّ الأَكْبَرُ يَوْمُ النَّحْرِ.
2. Abu Ali al-Ash’ariy has narrated from Muhammad ibn ‘Abd af-Jabbar from Safwan from Dharih who has said the following: “Abu ‘Abd Allah (a.s.), has said that the greater al-Hajj is the day of offering sacrifice.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī