Sahih Muslim , Book 40, Hadith 19 (In-Book) ⓘ
Abu Umama b. Sahl b. Hunaif, on the authority of his father, reported Allah's Messenger as saying: None of you should say:" My soul has become evil," but he should say:" My soul has become remorseless."
وَحَدَّثَنِي أَبُو الطَّاهِرِ، وَحَرْمَلَةُ، قَالاَ أَخْبَرَنَا ابْنُ وَهْبٍ، أَخْبَرَنِي يُونُسُ، عَنِ ابْنِ، شِهَابٍ عَنْ أَبِي أُمَامَةَ بْنِ سَهْلِ بْنِ حُنَيْفٍ، عَنْ أَبِيهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ يَقُلْ أَحَدُكُمْ خَبُثَتْ نَفْسِي . وَلْيَقُلْ لَقِسَتْ نَفْسِي " .
also referenced under: Hadith 2251 (Reference) & Book 27, Hadith 5597 (USC-MSA)