Language:
كتاب فضائل أصحاب النبى صلى الله عليه وسلم
62  
Companions of the Prophet
(13)
Chapter: The merits of Az-Zubair bin Al-'Awwam رضي الله عنه
(13)
باب مَنَاقِبُ الزُّبَيْرِ بْنِ الْعَوَّامِ
Sahih al-Bukhari 3719

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."

حَدَّثَنَا مَالِكُ بْنُ إِسْمَاعِيلَ، حَدَّثَنَا عَبْدُ الْعَزِيزِ ـ هُوَ ابْنُ أَبِي سَلَمَةَ ـ عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ، عَنْ جَابِرٍ ـ رضى الله عنه ـ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏ "‏ إِنَّ لِكُلِّ نَبِيٍّ حَوَارِيًّا، وَإِنَّ حَوَارِيَّ الزُّبَيْرُ بْنُ الْعَوَّامِ ‏"‏‏.‏
Reference : Sahih al-Bukhari 3719
In-book reference : Book 62, Hadith 0
USC-MSA web (English) reference : Vol. 5, Book 57, Hadith 64
  (deprecated numbering scheme)