William Muir,
The Caliphate: Its Rise, Decline and Fall…
“ There were three, he said, of whom he must beware—the two 'Abdallahs, sons of 'Omar and Az-Zubeir, and Al-Hosein son of 'Ali. The first, a pious devotee, would easily be put aside. "As for Al-Hosein," he continued, "the restless men of Al-'Irak will give him no peace till he attempt the Empire; when thou hast gotten the victory, deal gently with him, for truly the blood of the Prophet runneth in his veins. It is 'Abdallah son of Az-Zubeir that I fear the most for thee. Fierce as the lion, crafty as the fox, destroy him root and branch." ”
