Source:
The Holy Qur'an
Electronic Text Center, University of Virginia Library

According to the Holy Qur'an, Alexander was a Messenger of God whose mission was to bring the Kingdom of God to Earth.
 

Excerpt from Chapter (Sura) 18.

"18.83":    And they ask you about Zulqarnain. Say: I will recite to you an account of him.

"18.84":    Surely We established him in the land and granted him means of access to every thing.

"18.85":    So he followed a course.

"18.86":    Until when he reached the place where the sun set, he found it going down into a black sea, and found by it a people. We said: O Zulqarnain! either
give them a chastisement or do them a benefit.

"18.87":    He said: As to him who is injust, we will chastise him, then shall he be returned to his Lord, and He will chastise him with an exemplary
chastisement: And as for him who believes and does good, he shall have goodly reward, and We will speak to him an easy word of Our command.

"18.89":    Then he followed (another) course.

"18.90":    Until when he reached the land of the rising of the sun, he found it rising on a people to whom We had given no shelter from It;

"18.91":    Even so! and We had a full knowledge of what he had.

"18.92":     Then he followed (another) course.

"18.93":    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.

"18.94":    They said: O Zulqarnain! surely Gog and Magog make mischief in the land. Shall we then pay you a tribute on condition that you should raise a
barrier between us and them

"18.95":    He said: That in which my Lord has established me is better, therefore you only help me with workers, I will make a fortified barrier between you
and them;

"18.96":    Bring me blocks of iron; until when he had filled up the space between the two mountain sides, he said: Blow, until when he had made it (as) fire, he
said: Bring me molten brass which I may pour over it.

"18.97":    So they were not able to scale it nor could they make a hole in it.

"18.98":    He said: This is a mercy from my Lord, but when the promise of my Lord comes to pass He will make it level with the ground, and the promise of
my Lord is ever true.

"18.99":    And on that day We will leave a part of them in conflict with another part, and the trumpet will be blown, so We will gather them all together;

"18.100":    And We will bring forth hell, exposed to view, on that day before the unbelievers.

"18.101":    They whose eyes were under a cover from My reminder and they could not even hear.

"18.102":    What! do then those who disbelieve think that they can take My servants to be guardians besides Me? Surely We have prepared hell for the
entertainment of the unbelievers.

"18.103":    Say: Shall We inform you of the greatest losers in (their) deeds?

"18.104":    (These are) they whose labor is lost in this world's life and they think that they are well versed in skill of the work of hands.

"18.105":    These are they who disbelieve in the communications of their Lord and His meeting, so their deeds become null, and therefore We will not set up
a balance for them on the day of resurrection.

"18.106":    Thus it is that their recompense is hell, because they disbelieved and held My communications and My apostles in mockery.

"18.107":    Surely (as for) those who believe and do good deeds, their place of entertainment shall be the gardens of paradise,

"18.108":    Abiding therein; they shall not desire removal from them.

"18.109":    Say: If the sea were ink for the words of my Lord, the sea would surely be consumed before the words of my Lord are exhausted, though We
were to bring the like of that (sea) to add

"18.110":    Say: I am only a mortal like you; it is revealed to me that your god is one God, therefore whoever hopes to meet his Lord, he should do good
deeds, and not join any one in the service of his Lord.