Sahih Muslim , Book 43, Hadith 63 (In-Book) ⓘ
Sa`d reported that on the Day of Uhud I saw on the right side of Allah's Messenger and on his left side two persons dressed in white clothes and whom I did not see before nor after that, and they were Gabriel and Michael (Allah be pleased with both of them).
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا مُحَمَّدُ بْنُ بِشْرٍ، وَأَبُو أُسَامَةَ عَنْ مِسْعَرٍ، عَنْ سَعْدِ بْنِ إِبْرَاهِيمَ، عَنْ أَبِيهِ، عَنْ سَعْدٍ، قَالَ رَأَيْتُ عَنْ يَمِينِ، رَسُولِ اللَّهِ صلى الله عليه وسلم وَعَنْ شِمَالِهِ يَوْمَ أُحُدٍ رَجُلَيْنِ عَلَيْهِمَا ثِيَابُ بَيَاضٍ مَا رَأَيْتُهُمَا قَبْلُ وَلاَ بَعْدُ . يَعْنِي جِبْرِيلَ وَمِيكَائِيلَ عَلَيْهِمَا السَّلاَمُ .
also referenced under: Hadith 2306 (Reference) & Book 30, Hadith 5713 (USC-MSA)