Aya number 21 of surat Al-Ahqaf
بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ
وَاذْكُرْ أَخَا عَادٍ إِذْ أَنْذَرَ قَوْمَهُ بِالْأَحْقَافِ وَقَدْ خَلَتِ النُّذُرُ مِنْ بَيْنِ يَدَيْهِ وَمِنْ خَلْفِهِ أَلَّا تَعْبُدُوا إِلَّا اللَّهَ إِنِّي أَخَافُ عَلَيْكُمْ عَذَابَ يَوْمٍ عَظِيمٍ [٢١]
Translation: English - Sahih International
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."
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