Musnad Ahmad 1153:366

Hassan narrated to us, Ibn Lahi'ah narrated to us, he said: Abu al-Aswad narrated to us, that he heard Urwah narrating from Aisha, she said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "Let not one of you say, 'My soul is wicked (khabithah),' but let him say, 'My soul is self-reproaching (laqisah).'"