Qur'an 18:6 · Al-Kahf

فَلَعَلَّكَ بَٰخِعٌۭ نَّفْسَكَ عَلَىٰٓ ءَاثَٰرِهِمْ إِن لَّمْ يُؤْمِنُوا۟ بِهَٰذَا ٱلْحَدِيثِ أَسَفًا

(6) Then perhaps you would kill yourself through grief over them, [O Muḥammad], if they do not believe in this message, [and] out of sorrow.