Abu Dawud Book 31, Hadith Number 4277.
Chapter : Yellow dye.
Narated By Ali ibn Abu Talib : The Prophet (PBUH) said: A man called al-Harith ibn Harrath will come forth from Ma Wara an-Nahr. His army will be led by a man called Mansur who will establish or consolidate things for Muhammad’s family as Quraysh consolidated them for the Apostle of Allah (PBUH). Every believer must help him, or he said: respond to his sermons.