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bukhari:3718ʿUbayd b. Ismāʿīl > Abū Usāmah > Hishām from my father

While I was with ʿUthman, a man came to him and said, "Appoint your successor." ʿUthman said, "Has such successor been named?" He replied, "Yes, Az-Zubair." ʿUthman said, thrice, "By Allah! Indeed you know that he is the best of you."  

البخاري:٣٧١٨حَدَّثَنِي عُبَيْدُ بْنُ إِسْمَاعِيلَ حَدَّثَنَا أَبُو أُسَامَةَ عَنْ هِشَامٍ أَخْبَرَنِي أَبِي

سَمِعْتُ مَرْوَانَ كُنْتُ عِنْدَ عُثْمَانَ أَتَاهُ رَجُلٌ فَقَالَ اسْتَخْلِفْ قَالَ وَقِيلَ ذَاكَ قَالَ نَعَمْ الزُّبَيْرُ قَالَ أَمَا وَاللَّهِ إِنَّكُمْ لَتَعْلَمُونَ أَنَّهُ خَيْرُكُمْ ثَلاَثًا