Al-Kāfi

Hadith 1774
glorificationdua
5ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ النَّوْفَلِيِّ عَنِ السَّكُونِيِّ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ قَالَ رَسُولُ الله (صَلَّى اللهُ عَلَيْهِ وآلِه) خَيْرُ الْعِبَادَةِ قَوْلُ لا إِلَهَ إِلا الله.
5. Ali ibn Ibrahim has narrated from his father from al-Nawfali from al-Sakuni from Abu ‘Abdillah (a.s.) who has said the following: “The Messenger of Allah has said, ‘The best form of worship is saying, ‘No one deserves to be worshipped except Allah.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī