Surah Al-Qamar, ayah 18

كَذَّبَتۡ عَادٞ فَكَيۡفَ كَانَ عَذَابِي وَنُذُرِ ١٨

Kaddhabat 'ādun fakayfa kāna 'adhābī wanudhur

ʿAad denied; and how [severe] were My punishment and warning.