Sahih Muslim 5878
صحيح مسلم#5878SahihA'isha reported Allah's Messenger (ﷺ) having said:None of you should say: "My soul has become evil," but he should say: "My soul has become remorseless." This hadith has been transmitted on the authority of Abu Bakr with a slight variation of wording
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 40:17