It is narrated from Khaythamah bin Abd al-Rahman that he said: We were with Sayyiduna Hudhayfah (may Allah be pleased with him), and one of us said: "O Abu Abdullah! Tell us what you heard from the Messenger of Allah (peace and blessings be upon him)." He said: "If I were to do so, you would stone me." We said: "Subhan Allah! Would we do such a thing?" He said: "Tell me, if I were to tell you that some of your mothers will come against you with an army great in number and severe in might, would you believe it?" The people said: "Subhan Allah! Who could believe such a thing?" Then Hudhayfah (may Allah be pleased with him) said: "The red ones (the non-Arab slaves of Banu Umayyah) will come to you in a troop whose powerful slaves will drive it wherever your faces are turned (i.e. they will overpower you)." Then he got up and went into his room. This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.