Al-Kāfi

Hadith 1764
repentance
1ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ النَّوْفَلِيِّ عَنِ السَّكُونِيِّ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ قَالَ رَسُولُ الله (صَلَّى اللهُ عَلَيْهِ وآلِه) خَيْرُ الدُّعَاءِ الإسْتِغْفَارُ.
1. 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 prayer and plea before Allah for help is the plea for forgiveness and protection against the consequences of sins.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī