Al-Kahf 18:99

آتُونِي زُبَرَ الْحَدِيدِ ۖ حَتَّىٰ إِذَا سَاوَىٰ بَيْنَ الصَّدَفَيْنِ قَالَ انفُخُوا ۖ حَتَّىٰ إِذَا جَعَلَهُ نَارًا قَالَ آتُونِي أُفْرِغْ عَلَيْهِ قِطْرًا

Bring me sheets of iron" - until, when he had leveled [them] between the two mountain walls, he said, "Blow [with bellows]," until when he had made it [like] fire, he said, "Bring me, that I may pour over it molten copper."

فَمَا اسْطَاعُوا أَن يَظْهَرُوهُ وَمَا اسْتَطَاعُوا لَهُ نَقْبًا

So Gog and Magog were unable to pass over it, nor were they able [to effect] in it any penetration.

قَالَ هَـٰذَا رَحْمَةٌ مِّن رَّبِّي ۖ فَإِذَا جَاءَ وَعْدُ رَبِّي جَعَلَهُ دَكَّاءَ ۖ وَكَانَ وَعْدُ رَبِّي حَقًّا

[Dhul-Qarnayn] said, "This is a mercy from my Lord; but when the promise of my Lord comes, He will make it level, and ever is the promise of my Lord true."

وَعَرَضْنَا جَهَنَّمَ يَوْمَئِذٍ لِّلْكَافِرِينَ عَرْضًا

And We will present Hell that Day to the Disbelievers, on display -

الَّذِينَ كَانَتْ أَعْيُنُهُمْ فِي غِطَاءٍ عَن ذِكْرِي وَكَانُوا لَا يَسْتَطِيعُونَ سَمْعًا

Those whose eyes had been within a cover [removed] from My remembrance, and they were not able to hear.

أَفَحَسِبَ الَّذِينَ كَفَرُوا أَن يَتَّخِذُوا عِبَادِي مِن دُونِي أَوْلِيَاءَ ۚ إِنَّا أَعْتَدْنَا جَهَنَّمَ لِلْكَافِرِينَ نُزُلًا

Then do those who disbelieve think that they can take My servants instead of Me as allies? Indeed, We have prepared Hell for the disbelievers as a lodging.