Mishkat al-Masabih 28 Events of the Day of Resurrection and the Beginning of Creation كتاب أحوال القيامة وبدء الخلق 50

عَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: ” أَسْعَدُ النَّاسِ بِشَفَاعَتِي يَوْمَ الْقِيَامَةِ مَنْ قَالَ: لَا إِلَهَ إِلَّا اللَّهُ خَالِصا من قلبه أونفسه ” رَوَاهُ البُخَارِيّ

Abu Huraira reported the Prophet as saying, “The one who will be most fortunate by reason of my intercession on the day of resurrection will be the one who says there is no god but God sincerely from his heart,” or, “his soul.” Bukhari transmitted it.