وَإِن يُكَذِّبوكَ فَقَد كَذَّبَت قَبلَهُم قَومُ نوحٍ وَعادٌ وَثَمودُ

And if they deny you, [O Muhammad] - so, before them, did the people of Noah and 'Aad and Thamud deny [their prophets],