Sahih al-Bukhari, Hadith 5826 ⓘ
Narrated Sa`d: On the day of the battle of Uhud, on the right and on the left of the Prophet were two men wearing white clothes, and I had neither seen them before, nor did I see them afterwards.
حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ الْحَنْظَلِيُّ، أَخْبَرَنَا مُحَمَّدُ بْنُ بِشْرٍ، حَدَّثَنَا مِسْعَرٌ، عَنْ سَعْدِ بْنِ إِبْرَاهِيمَ، عَنْ أَبِيهِ، عَنْ سَعْدٍ، قَالَ رَأَيْتُ بِشِمَالِ النَّبِيِّ صلى الله عليه وسلم وَبِيَمِينِهِ رَجُلَيْنِ عَلَيْهِمَا ثِيَابٌ بِيضٌ يَوْمَ أُحُدٍ، مَا رَأَيْتُهُمَا قَبْلُ وَلاَ بَعْدُ.
also referenced under: Book 77, Hadith 43 (In-Book) & Volume 7, Book 72, Hadith 716 (USC-MSA)