(Those before them plotted) against their prophets, just as the leaders of Quraysh who were slain in the valley of Badr plotted against Muhammad (pbuh); the reference here is to the tyrant Nimrod who built the tower, (so Allah struck at the foundations of their building) Allah extracted their tower from its foundation, (and then the roof fell down upon them) the tower fell upon him (from above them, and the doom came on them) through this destruction (whence they knew not);