فَإِنْ أَعْرَضُوا۟ فَقُلْ أَنذَرْتُكُمْ صَـٰعِقَةً مِّثْلَ صَـٰعِقَةِ عَادٍ وَثَمُودَ
Fa-in a'radoo faqul anzartukum saa'iqatam misla saa'iqati 'Aadinw wa Samood
If they turn away, say, ‘I have warned you about a blast like the one which struck 'Ad and Thamud:
If they turn away, then say: I have warned you of a thunderbolt like the thunderbolt that struck 'Ad and Thamud.