Saad bin Abu Waqqas reported,

I saw the Messenger of Allah ﷺ on the day of Uhud, and with him were two men dressed in white garments fighting in his defense with the fiercest fighting. I had never seen them before, nor did I ever see them afterward.

Bukhari 4054

Sahih

حدثنا عبد العزيز بن عبد الله حدثنا إبراهيم بن سعد عن أبيه عن جده

عن سعد بن أبي وقاص رضي الله عنه قال

رأيت رسول الله ﷺ يوم أحد ومعه رجلان يقاتلان عنه عليهما ثياب بيض كأشد القتال ما رأيتهما قبل ولا بعد

البخاري 4054صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Expeditions
Chapter
When two parties among you were about to lose heart, but Allah was their protector, and upon Allah let the believers rely
Numbering
Darussalam 4054
Bukhari 4054