Musnad Abu Ya'la al-Mawsili 161:17

Abu Bakr ibn Abi al-Nadr narrated to us, Abu al-Nadr narrated to us, he said: al-Murajja ibn Raja’ al-Yashkuri narrated to me, ‘Isa ibn Hilal narrated to us, from Bashir ibn Nahik, he said: I heard Abu Hurayrah saying: My intimate friend, Abu al-Qasim (may Allah bless him and grant him peace), narrated to me, he said: "The Hour will not be established until a man from my household emerges against them, and he will strike them until they return to the truth." He said: I said, "And how long will it be?" He said: "Five and two." He said: I said, "What is five and two?" He said: "I do not know."