مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1468
Musnad Abu Ishaq Sa'd bin Abi Waqqas
It was narrated that Sa’d bin Abi Waqqas said: On the day of Uhud, I saw on the right of the Messenger of Allah (ﷺ) and on his left, two men in white garments who were fighting to defend him in the fiercest manner, I have never seen them before or since.
Musnad Ahmad 1468Sahih (Darussalam)]