It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Ya'juj and Ma'juj (their barrier) will be opened, as Allah, the Mighty and Majestic, has said: 'And they will come rushing down from every elevation.'" [Surah al-Anbiya: 96] Ibn Ishaq said that in the recitation of Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) this word is "jadath" (instead of "hadab"), with jim and tha, like the statement of Allah Almighty: "They will come rushing out of their graves to their Lord." [Surah Ya Sin: 51] And "jadath" means grave. This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it.