(10) باب فِي قِتَالِ جِبْرِيلَ وَمِيكَائِيلَ عَنِ النَّبِيِّ صلى الله عليه وسلم يَوْمَ أُحُدٍ
Sa`d reported that on the Day of Uhud I saw on the right side of Allah's Messenger (ﷺ) 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).
Reference: Sahih Muslim 2306 a
In-book reference: Book 43, Hadith 63
USC-MSA web (English) reference(deprecated numbering scheme): Book 30, Hadith 5713