"So if they turn away"—meaning the polytheists—"then say: I have warned you of a thunderbolt like the thunderbolt of 'Ad and Thamud," meaning: the punishment.
﴿فَإِن أَعرضُوا﴾ يَعْنِي: الْمُشْركين ﴿فَقُلْ أَنْذَرْتُكُمْ صَاعِقَةً مثل صَاعِقَة عَاد وَثَمُود﴾ يَعْنِي: الْعَذَاب
