It was narrated from Thawban that the Messenger of Allah (ﷺ) said: "Three will fight one another for your treasure, each one of them the son of a caliph, but none of them will gain it. Then the black banners will come from the east, and they will kill you in an unprecedented manner." Then he mentioned something that I do not remember, then he said: "When you see them, then pledge your allegiance to them even if you have to crawl over the snow, for that is the caliph of Allah, Mahdi."

لا تلتقي أسانيد هذه الأحاديث عند راوٍ واحد، وهي على ٤ رواة في أعلاها.