Sa`d b. Abu Waqqas told that at the battle of Uhud he saw two men in white clothing whom he had never seen before or since fighting as violently as possible on the right and left of God's messenger, meaning Gabriel and Michael. (Bukhari and Muslim.)
Hadith Referenceمشكوة المصابيح / كتاب الفضائل والشمائل / 5875
Hadith Gradingالألبانی:مُتَّفَقٌ عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (4045) و مسلم (46/ 2306)»