The Prophet ﷺ said, "None of you should say Khabuthat Nafsi, but he is recommended to say 'Laqisat Nafsi." (Using translation from Bukhārī 6179)
قَالَ رَسُولُ اللهِ ﷺ لَا يَقُولَنَّ أَحَدُكُمْ خَبُثَتْ نَفْسِي وَلَكِنْ لِيَقُلْ لَقِسَتْ نَفْسِي خَالَفَهُ يُونُسُ وَإِسْحَاقُ بْنُ رَاشِدٍ