Surah Ash-Shu'ara, verse 1

تِلْكَ ءَايَـٰتُ ٱلْكِتَـٰبِ ٱلْمُبِينِ ﴿٢﴾

These are the verses of the clear Book.

لَعَلَّكَ بَـٰخِعٌۭ نَّفْسَكَ أَلَّا يَكُونُوا۟ مُؤْمِنِينَ ﴿٣﴾

Perhaps, [O Muḥammad], you would kill yourself with grief that they will not be believers.