(Indeed, Hell has been a place of ambush) meaning: it lies in wait for those upon whom the punishment has been decreed. The Bridge (al-Sirat) is over it; so whoever is among its people falls into it, and whoever is not...
﴿إِن جَهَنَّم كَانَت مرصادًا﴾ أَيْ: تَرْصُدُ مَنْ حَقَّ عَلَيْهِ الْعَذَابُ، وَالصِّرَاطُ عَلَيْهَا، فَمَنْ كَانَ مِنْ أَهْلِهَا هَوَى فِيهَا، وَمَنْ لَمْ يَكُنْ
