Al-Kāfi

Hadith 834
good-deedsrepentance
6ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنِ الْقَاسِمِ بْنِ عُرْوَةَ عَنْ أَبِي الْعَبَّاسِ قَالَ قَالَ أَبُو عَبْدِ الله (عَلَيهِ السَّلام) مَنْ سَرَّتْهُ حَسَنَتُهُ وَسَاءَتْهُ سَيِّئَتُهُ فَهُوَ مُؤْمِنٌ‏.
6. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from al-Qasim ibn ‘Urwah from abu al-‘Abbas who has said that Abu ‘Abdillah (a.s.) has said the following: “Whoever enjoys a virtuous deed and is disgusted with a sin is a believer.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī