What did `Uthman say when he was asked to appoint a successor?
 Narrated Marwan bin Al-Hakam:                     While I was with `Uthman, a man came to him and said, "Appoint your successor." `Uthman said, "Has such successor been named?" He replied, "Yes, Az-Zubair." `Uthman said, thrice, "By Allah! Indeed you know that he is the best of you."