(4) باب كَرَاهَةِ قَوْلِ الإِنْسَانِ خَبُثَتْ نَفْسِي
Abu Umama b. Sahl b. Hunaif, on the authority of his father, reported Allah's Messenger (ﷺ) as saying:
None of you should say:" My soul has become evil," but he should say:" My soul has become remorseless."
Reference: Sahih Muslim 2251
In-book reference: Book 40, Hadith 19
USC-MSA web (English) reference(deprecated numbering scheme): Book 27, Hadith 5597