Surah Fussilat, Verse 13

فَإِنۡ أَعۡرَضُواْ فَقُلۡ أَنذَرۡتُكُمۡ صَٰعِقَةٗ مِّثۡلَ صَٰعِقَةِ عَادٖ وَثَمُودَ١٣

fa-in aʿraḍū faqul andhartukum ṣāʿiqatan mith'la ṣāʿiqati ʿādin wathamūda

But if they turn away, then say, "I have warned you of a thunderbolt like the thunderbolt [that struck] ʿAad and Thamūd.