Quran 41:13

فَإِنۡ أَعۡرَضُواْ فَقُلۡ أَنذَرۡتُكُمۡ صَـٰعِقَةً۬ مِّثۡلَ صَـٰعِقَةِ عَادٍ۬ وَثَمُودَ ١٣

If they turn away, then say, "I am warning you of a disaster like the disaster that annihilated `Aad and Thamoud."