Hadith No: 2
Al-Hakim al-Nisaburi - al-Mustadrak ala al-Sahihayn
Book of Trials and Omens - Mentioning the Appearance of al-Mahdi (peace be upon him)
Volume: (4) - Page Number: (464)
8482 - Abu Bakr ibn Darim al-Hafiz narrated to me in Kufa: He said, Muhammad ibn Uthman ibn Sa'id al-Qurashi narrated to us, offering his condolences, and he said: Yazid ibn Muhammad al-Thaqafi narrated to us, Haban ibn Sudayr narrated to us from Amr ibn Qays al-Malai'i, from al-Hakam, from Ibrahim, from Alqamah ibn Qays and Ubaydah al-Salmani, from Abdullah ibn Mas'ud (may Allah be pleased with him), who said: We came to the Messenger of Allah (peace be upon him and his holy progeny), and he came out to us beaming with joy, with a visible sense of happiness on his face. We did not ask him about anything except that he informed us, nor did we remain silent except that he initiated the conversation, until a group of young men from Bani Hashim passed by, among them Hassan and Hussein. When he saw them, he embraced them, and his eyes filled with tears. So we said, "O Messenger of Allah, we continue to see something in your face that we dislike." He said: "Indeed, we are a family that Allah has chosen for us the Hereafter over this world, and my family will face expulsion and persecution in the lands after me, until black banners appear from the East. They will ask for the truth, but they will not be given it. Then they will ask again, but they will not be given it. Then they will ask once more, but they will not be given it, and they will fight and be victorious.
Whoever among you or from your descendants encounters that time, let him go to the Imam of my family, even if he has to crawl through the snow, for these are guiding banners that they will deliver to a man from my family whose name matches my name and whose father's name is the name of my father, and he will rule the Earth, filling it with justice and fairness, just as it has been filled with oppression and injustice."