Ya'jooj and Ma'jooj (Gog and Magog)
Ya'jooj and Ma'jooj are human beings, descended from Aadam and Hawwa (Eve), upon whom be peace. According to the descriptions of them given in the ahaadeeth, they belong to the Turkic Mongol race, having small eyes, small, flat noses and wide faces. Their faces look like hammered-out shields (their faces are likened to shields because they are wide and round).
Their appearance at the end of time is one of the signs of the Hour, as indicated in the Qur'aan (interpretation of the meaning): "Until, when Ya'jooj and Ma'jooj are let loose (from their barrier), and they swiftly swarm from every mound. And the true promise (Day of Resurrection) shall draw near (to fulfilment). Then (when mankind is resurrected from their graves, you shall see the eyes of the disbelievers fixedly stare in horror. (They will say): 'Woe to us! We were indeed heedless of this; nay, but we were zaalimoon (polytheists and wrong-doers, etc.)." [al-Anbiyaa' 21:96-97]
In the story of Dhoo'l-Qarnayn, Allaah tells us (interpretation of the meaning): "Then he followed (another) way, until, when he reached between two mountains, he found, before (near) them (those two mountains), a people who scarcely understood a word. They said: 'O Dhoo'l-Qarnayn! Verily! Ya'jooj and Ma'jooj are doing great mischief in the land. Shall we then pay you a tribute in order that you might erect a barrier between us and them?' He said: 'That (wealth, authority and power) in which my Lord has established me is better (than your tribute). So help me with strength (of men), I will erect between you and them a barrier. Give me pieces (blocks) or iron,' then, when he had filled up the gap between the two mountain-cliffs, he said, 'Blow,' till when he had made it (red as) fire, he said, 'Bring me molten copper to pour over it.' So they [Ya'jooj and Ma'jooj] were made powerless to scale it or dig through it. (Dhoo'l-Qarnayn) said: 'This is a mercy from my Lord, but when the Promise of my Lord comes, He shall level it down to the ground. And the Promise of my Lord is ever true.' And on that Day [i.e., the day Ya'jooj and Ma'jooj will come out], We shall leave them to surge like waves on one another, and the Trumpet will be blown, and We shall collect them all together." [al-Kahf 18:92-99]
Ya'jooj and Ma'jooj are also mentioned in the Sunnah, in more than one hadeeth, including the following:
1. Umm Habeebah bint Abi Sufyaan reported from Zaynab bint Jahsh that the Messenger of Allaah (peace and blessings of Allaah be upon him) entered upon her one day in a nervous state, saying, "La ilaaha ill-Allaah! Woe to the Arabs from the evil that has approached! Today a hole this big has appeared in the barrier of Ya'jooj and Ma'jooj," and he made a circle with his thumb and forefinger. Zaynab bint Jahsh said, "O Messenger of Allaah, will we be destroyed even though there are righteous people among us?" He said, "Yes, if evil becomes widespread." (Reported by al-Bukhaari, 6/381, Muslim, 18/2).
2. Al-Nawaas ibn Sam'aan (may Allaah be pleased with him) reported a long hadeeth describing several signs of the Hour. In this hadeeth, the Prophet (peace and blessings of Allaah be upon him) said: "… and Allaah will send Ya'jooj and Ma'jooj, swiftly swarming from every mound. They will pass the lake of Tiberias [in Palestine] and will drink everything that is in it. Then the last of them will pass by and will say, 'There used to be water here once.' The Prophet of Allaah, 'Eesaa, and his companions, will be besieged until a bull's head will be more precious to one of them than a hundred dinars are to any of you today. 'Eesaa and his companions will pray to Allaah, and Allaah will send a kind of worm (like that found in the noses of camels and sheep) on their (Ya'jooj and Ma'jooj) necks, and they will fall down dead, all at once. Then 'Eesaa and his companions will come down out of the place where they were besieged, and they will find hardly a handspan of land that is not filled with the stench (of Ya'jooj and Ma'jooj), so 'Eesaa and his companions will pray to Allaah, and He will send birds like the necks of camels to carry them away and throw them wherever Allaah wills." (Reported by Muslim, 18/68).