Explained in detail 41:13
فَإِنْ أَعْرَضُوا۟ فَقُلْ أَنذَرْتُكُمْ صَٰعِقَةً مِّثْلَ صَٰعِقَةِ عَادٍ وَثَمُودَ
But if they turn away, then say, "I have warned you of a thunderbolt like the thunderbolt [that struck] 'Aad and Thamud.
Saheeh International
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