لماذا تُذكر عاد وثمود مقترنتين غالبًا في القرآن الكريم؟

The repeated mention of 'Ad and Thamud in the Quran is because Quraish used to pass by their lands and ruins in Yemen and Syria, which reminded them of the tyranny and power of these two nations, which did not prevent them from Allah's punishment. Thus, this served as a lesson for Quraish and others not to be deceived by strength and multitude.