Narrated: Anas bin Malik r,a, that the Messenger of Allah (saw) said: “The most merciful of my Ummah towards my Ummah is Abu Bakr;
the one who adheres most sternly to the religion of Allah is Umar;
the most sincere of them in shyness and modesty is Uthman;
the best judge is Ali bin Abu Talib;
the best in reciting the Book of Allah is Ubayy bin Kab;
the most knowledgeable of what is lawful and what is unlawful is Muadh bin Jabal;
and the most knowledgeable of the rules of inheritance (Faraid) is Zaid bin Thabit.
And every nation has a trustworthy guardian, and the trustworthy guardian of this Ummah is Abu Ubaidah bin Jarrah.”