The merits of Az-Zubair bin Al-'Awwam رضي الله عنه Sahih al-Bukhari 3718

Arabic hadith text
حَدَّثَنِي عُبَيْدُ بْنُ إِسْمَاعِيلَ، حَدَّثَنَا أَبُو أُسَامَةَ، عَنْ هِشَامٍ، أَخْبَرَنِي أَبِي، سَمِعْتُ مَرْوَانَ، كُنْتُ عِنْدَ عُثْمَانَ، أَتَاهُ رَجُلٌ فَقَالَاسْتَخْلِفْ‏.‏ قَالَ وَقِيلَ ذَاكَ قَالَ نَعَمْ، الزُّبَيْرُ‏.‏ قَالَ أَمَا وَاللَّهِ إِنَّكُمْ لَتَعْلَمُونَ أَنَّهُ خَيْرُكُمْ‏.‏ ثَلاَثًا‏.‏
Translation
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."