Companions of the Prophet
62/13. Chapter:
The merits of Az-Zubair bin Al-'Awwam رضي الله عنه
قَالَ ابْنُ عَبَّاسٍ هُوَ حَوَارِيُّ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ، وَسُمِّيَ الْحَوَارِيُّونَ لِبَيَاضِ ثِيَابِهِمْ.Ibn 'Abbas said, "He (i.e., Az-Zubair) was the Hawari (i.e., disciple) of the Prophet ﷺ. And the Hawariyyun were called so because of the whiteness of their clothes."
Sahih Bukhari
حَدَّثَنِي 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.
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."
Reference : Sahih al-Bukhari 3718In-book reference : Book 62, Hadith 66USC-MSA web (English) reference : Vol. 5, Book 57, Hadith 64