الاحقاف — Al-Ahqaf Ayat 21
۞ وَاذْكُرْ اَخَا عَادٍۗ اِذْ اَنْذَرَ قَوْمَهٗ بِالْاَحْقَافِ وَقَدْ خَلَتِ النُّذُرُ مِنْۢ بَيْنِ يَدَيْهِ وَمِنْ خَلْفِهٖٓ اَلَّا تَعْبُدُوْٓا اِلَّا اللّٰهَ ۗاِنِّيْٓ اَخَافُ عَلَيْكُمْ عَذَابَ يَوْمٍ عَظِيْمٍ
Ważkur akhā ‘ād(in), iż anżara qaumahū bil-aḥqāfi wa qad khalatin-nużuru mim baini yadaihi wa min khalfihī allā ta‘budū illallāh(a), innī akhāfu ‘alaikum ‘ażāba yaumin ‘aẓīm(in).
"And mention, [O Muhammad], the brother of 'Aad, when he warned his people in the [region of] al-Ahqaf - and warners had already passed on before him and after him - [saying], "Do not worship except Allah. Indeed, I fear for you the punishment of a terrible day.""