Al-Kāfi

Hadith 1440
congregational-prayer
3ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ النَّوْفَلِيِّ عَنِ السَّكُونِيِّ عَنْ أَبِي عَبْدِ الله عَنْ أَبِيهِ (عَلَيْهِ الْسَّلام) قَالَ قَالَ رَسُولُ الله (صلّى اللهُ عَلَيْهِ وَآلِه) مَنْ صَلَّى الْخَمْسَ فِي جَمَاعَةٍ فَظُنُّوا بِهِ خَيْراً.
3. Ali ibn Ibrahim has narrated from his father from al-Nawfaliy, from al-Sakuniy who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘The Messenger of Allah has said, “If one performs the five Salah (prayer) in congregation you should think good about him.’””
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī