Sura 41 Fussilat (Explained In Detail), ayah 13

1. فَإِنْ أَعْرَضُوا فَقُلْ أَنْذَرْتُكُمْ صَاعِقَةً مِثْلَ صَاعِقَةِ عَادٍ وَثَمُودَ

   But if they turn away, then say, "I have warned you of a thunderbolt like the thunderbolt (that struck) 'Aad and Thamud.

   41:13

Translation: Saheeh International