Surah Al-Ahqaf (The Sand-Hills), Verse 21

وَاذْكُرْ اَخَا عَادٍ اِذْ اَنْذَرَ قَوْمَهٗ بِالْاَحْقَافِ وَقَدْ خَلَتِ النُّذُرُ مِنْ بَیْنِ یَدَیْهِ وَمِنْ خَلْفِهٖۤ اَلَّا تَعْبُدُوْۤا اِلَّا اللّٰهَ اِنِّیْۤ اَخَافُ عَلَیْكُمْ عَذَابَ یَوْمٍ عَظِیْمٍ ۟

Wazkur akhaa 'Aad, iz anzara qawmahoo bil Ahqaafi wa qad khalatin nuzuru mim baini yadaihi wa min khalfiheee allaa ta'budooo illal laaha inneee akhaafu 'alaikum 'azaaba Yawmin 'azeem

“Mention (Hud) one of 'Ad's (own) brethren: Behold, he warned his people about the winding Sand-tracts: but there have been warners before him and after him: "Worship ye none other than Allah: Truly I fear for you the Penalty of a Mighty Day."”

Quran 46:21 (Yusuf Ali Translation)