sometime we need to know other fact about ya'juj and ma'juj..just read this post..take it as ur extra info('' ,)

Ya'juj and Ma'juj (Gog and Magog)

The emergence of the mighty tribes of Ya'juj and Ma'juj is also a major sign of Qiyamah.

Allah says in the Qur'an, "When Ya'juj and Ma'juj are let loose (from their Barrier) and they swiftly swarm from every mound" (Surah Al-Anbiya)

Allah says in the Qur'an, " (Zulqarnain) said, 'This is a mercy from my Lord, but when the promise of my Lord comes, He shall level it down (the barrier) to the ground. And the promise of my Lord is ever true." (Surah al-Kahf)

Zaynab bint Jahsh says: "Once the Prophet awoke from such a sleep that his face was red and these words were on his tongue, "There is none worthy of worship but Allah. Destruction is upon the Arabs on account of that evil which has come close to them. Today a hole as big as this has opened in the wall of Yajuj and Majuj. (The Prophet indicated the size of the hole with his finger and thumb)" (Bukhari/Muslim)

In the lengthy Hadith of Nawwas ibn Saman it has been mentioned, "And Allah will send Yajuj and Majuj and they will come from every lofty place." (Muslim)