18:6
فَلَعَلَّكَ بَـٰخِعࣱ نَّفۡسَكَ عَلَىٰۤ ءَاثَـٰرِهِمۡ إِن لَّمۡ یُؤۡمِنُوا۟ بِهَـٰذَا ٱلۡحَدِیثِ أَسَفًا
Yet it may be, if they believe not in this statement, that thou (Muhammad) wilt torment thy soul with grief over their footsteps.
— Mohammed Marmaduke William Pickthall
Fala'allaka baakhi'un nafsaka 'alaaa aasaarihim illam yu;minoo bihaazal hadeesi asafaa