Ṣifāt al-Shīʿa

Hadith 62
repentance
وَ بِهَذَا اَلْإِسْنَادِ قَالَ قَالَ رَسُولُ اَللَّهِ ص مَنْ سَاءَتْهُ سَيِّئَةٌ وَ سَرَّتْهُ حَسَنَةٌ فَهُوَ مُؤْمِنٌ.
(The same previous series of relaters)… The Prophet (s) said: He who is displeased by his evil deeds and pleased by his good deeds, then he is a believer.
Source: Shaykh Muḥammad b. ʿAlī al-Ṣaduq