13فَإِن أَعرَضوا فَقُل أَنذَرتُكُم صاعِقَةً مِثلَ صاعِقَةِ عادٍ وَثَمودَE. H. PalmerBut if they turn aside, then say, 'I have warned you of a thunder-clap like the thunder-clap of 'Ad and Thamud;