Musnad Ahmad 948:4

Ishaq ibn Isa narrated to us, Malik informed me, from Hisham ibn Urwah, from his father, from Abdullah ibn al-Zubayr, from Sufyan ibn Abi Zuhayr, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Yemen will be conquered, and a people will come driving their livestock (to migrate)." Then he mentioned the rest of the hadith.