13فَإِن أَعرَضوا فَقُل أَنذَرتُكُم صاعِقَةً مِثلَ صاعِقَةِ عادٍ وَثَمودَShabbir AhmedBut if they turn away, then tell them, "I warn you of a thunder (of Requital) like the thunder of Aad and Thamud."