Ash-Shu'ara 26:1

تِلْكَ آيَاتُ الْكِتَابِ الْمُبِينِ

These are the verses of the clear Book.

لَعَلَّكَ بَاخِعٌ نَّفْسَكَ أَلَّا يَكُونُوا مُؤْمِنِينَ

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

إِن نَّشَأْ نُنَزِّلْ عَلَيْهِم مِّنَ السَّمَاءِ آيَةً فَظَلَّتْ أَعْنَاقُهُمْ لَهَا خَاضِعِينَ

If We willed, We could send down to them from the sky a sign for which their necks would remain humbled.