O Dhu-l-qarnain, either punish them or do them a benefit.

87 He said: As for him who is unjust, we shall chastise him, then he will be returned to his Lord, and He will chastise him with an exemplary chastisement.

88 And as for him who believes and does good, for him is a good reward, and We shall speak to him an easy word of Our command.

89 Then he followed a course.

90 Until, when he reached (the land of) the rising sun, he found it rising on a people to whom We had given no shelter from it —

91 So it was. And We had full knowledge of what he had.

92 Then he followed a course.

93 Until, when he reached (a place) between the two mountains, he found on that side of them a people who could hardly understand a word.

94 They said: O Dhu-l-qarnain, Gog and Magog do mischief in the land. May we then pay thee tribute on condition that thou raise a barrier between us and them?

95 He said: That wherein my Lord has established me is better, so if only you help me with strength (of men), I will make a fortified barrier between you and them:

96 Bring me blocks of iron. At length, when he had filled up the space between the two mountain sides, he said, Blow. Till, when he had made it (as) fire, he said: Bring me molten brass to pour over it.

97 So they were not able to scale it, nor could they make a hole in it.

98 He said: This is a mercy from my Lord, but when the promise of my Lord comes to pass He will crumble it, and the promise of my Lord is ever true.

99 And on that day We shall let some of them surge against others and the trumpet will be blown, then We shall gather them all together,

100 And We shall bring forth hell, exposed to view, on that day before the disbelievers,