Ya'juj and Ma'juj

It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that he mentioned a marfu' hadith, then he began to tell us: "Indeed Gog and Magog are from the children of Adam, and if they were let loose upon the people, they would ruin and destroy their means of livelihood and economy. Not one of them dies until he leaves behind a thousand or even more offspring from his progeny. And behind them are three more nations, whose names are: Tawil, Taris and Mansak."
In the chain of this hadith, Abu Ishaq al-Sabi'i is a mudallis narrator who became confused in his memory (mukhtalit), and also the biography of Wahb bin Jabir is not well known; therefore there is weakness in its chain. However, that Gog and Magog are from the children of Adam is established by other sahih reports.

It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that he said: "Gog and Magog dig (at the barrier and wall behind which they are confined) every day."
Imam Abu Ya'la narrated this hadith in his Musnad and its chain is hasan (good); also, a detailed report with this meaning was recorded by Imam al-Tirmidhi and Imam Ibn Majah, which al-Albani (may Allah have mercy on him) declared sahih (authentic).

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The Hour will not be established in the presence of any believer. (Before it) Allah Almighty will send a special wind which will blow, and no believer will remain on the face of the earth; rather they will all die (from the effect of that wind)."
The chain of this hadith is jayyid (good). Imam Ahmad narrated it in his Musnad, and there are also reports with this meaning in Sahih Muslim, according to which the Hour will be established upon the worst of people.

It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) (the narrator thinks that he attributed it to the Prophet (peace and blessings be upon him)) that he (peace and blessings be upon him) said: "The Hour will not be established until Allah Almighty sends a red wind from the direction of Yemen; then Allah, the Mighty and Majestic, will gather up (take the soul of) every soul that believes in Allah Almighty and the Last Day through this wind. The people will not perceive the destructiveness of this (wind), because the number of those dying in it (at one time) will seem small; there will only be (talk among the people) that an old man died among Banu so-and-so and an old woman died among Banu so-and-so. And one night the Book of Allah Almighty (the Noble Qur'an) will be taken away; it will be raised up towards the heaven, and not a single verse of it will remain on the earth. And the earth will throw out the pieces of its liver, that is, gold and silver (in the form of treasures), but after that day no benefit will be derived from them, so much so that a man will pass by there, kick these (treasures) with his feet and say: For the sake of this (wealth) the people before us used to kill one another, and today it is in such a state that no benefit is being derived from it."
[Al-Hakim recorded it in al-Mustadrak 'ala al-Sahihayn: 8475, and said: This hadith has a sahih (authentic) chain, and they (Bukhari and Muslim) did not record it; and al-Dhahabi agreed with him.]