question #1 Sahih al-Bukhari 2824, Book 56, Hadith 40 : Who were the companions mentioned in the narration and what is their significance in Islamic history?

I was in the company of Talha bin ‘Ubaidullah, Sa`d, Al-Miqdad bin Al-Aswad and `Abdur Rahman
bin `Auf and I heard none of them narrating anything from Allah’s Messenger (ﷺ) but Talha was talking
about the day (of the battle) of Uhud.