Al Ahqaf, 21 Ayah
46:21
۞ وَٱذۡكُرۡ أَخَا عَادٍ إِذۡ أَنذَرَ قَوۡمَهُۥ بِٱلۡأَحۡقَافِ وَقَدۡ خَلَتِ ٱلنُّذُرُ مِنۢ بَيۡنِ يَدَيۡهِ وَمِنۡ خَلۡفِهِۦٓ أَلَّا تَعۡبُدُوٓاْ إِلَّا ٱللَّهَ إِنِّيٓ أَخَافُ عَلَيۡكُمۡ عَذَابَ يَوۡمٍ عَظِيمٖ ٢١
Wa Adhkur 'Akhā `Ādin 'Idh 'Andhara Qawmahu Bil-'Aĥqāfi Wa Qad Khalati An-Nudhuru Min Bayni Yadayhi Wa Min Khalfihi 'Allā Ta`budū 'Illā Al-Laha 'Innī 'Akhāfu `Alaykum `Adhāba Yawmin `Ažīmin
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."