Majma al-Zawaid — Hadith 12399

Sayyidah Umm Salamah (may Allah be pleased with her) narrates: I heard the Prophet (peace and blessings be upon him) say: "Disagreement will arise at the death of a caliph. Then a man from Banu Hashim will come forth and come to Makkah. People will compel him to leave his house; he will come between the Black Stone and the Station of Ibrahim. Then an army from Syria will come to fight him, until, when they reach the place of al-Bayda', they will be swallowed up by the earth. Then the troops of Iraq and the Abdal of Syria will come to him. Then a man will appear in Syria whose maternal uncles are from Banu Kalb; his army will come (to fight the Mahdi), and Allah Almighty will rout them, and those people will be defeated, and on that day Banu Kalb will be defeated. The loser is the one who misses out on the spoils of Banu Kalb. Then the treasures will be opened up, and he (that is, the Mahdi) will distribute the wealth and give Islam dominance on the earth, and the people will live in that state for seven years (the narrator is in doubt; perhaps the words are:) nine years."
Al-Tabarani recorded it in al-Mu'jam al-Awsat, and its narrators are the narrators of the Sahih.