There were ten Sahaabah (radhiyallahu ‘anhum) who were given the glad tidings of Jannah by Rasulullah (sallallahu ‘alaihi wasallam) in one gathering. Due to these Sahaabah (radhiyallahu ‘anhum) receiving the glad tidings of Jannah from Rasulullah (sallallahu ‘alaihi wasallam) in one gathering, they are famously known as the Asharah Mubasharah (the ten who were given glad tidings of Jannah). These were not the only Sahaabah who received glad tidings of Jannah from Rasulullah (sallallahu ‘alaihi wasallam). At other occasions, Rasulullah (sallallahu ‘alaihi wasallam) had given individual glad tidings of Jannah to other Sahaabah (radhiyallahu ‘anhum) as well.
Hazrat ‘Abdur Rahmaan bin ‘Auf (radhiyallahu ‘anhu) reports that Rasulullah (sallallahu ‘alaihi wasallam) said, “Hazrat Abu Bakr (radhiyallahu ‘anhu) is among the people of Jannah, Hazrat ‘Umar (radhiyallahu ‘anhu) is among the people of Jannah, Hazrat ‘Uthmaan (radhiyallahu ‘anhu) is among the people of Jannah, Hazrat ‘Ali (radhiyallahu ‘anhu) is among the people of Jannah, Hazrat Talhah (radhiyallahu ‘anhu) is among the people of Jannah, Hazrat Zubair (radhiyallahu ‘anhu) is among the people of Jannah, Hazrat ‘Abdur Rahmaan bin ‘Auf (radhiyallahu ‘anhu) is among the people of Jannah, Hazrat Sa’d (radhiyallahu ‘anhu) is among the people of Jannah, Hazrat Sa‘eed (radhiyallahu ‘anhu) is among the people of Jannah and Hazrat Abu ‘Ubaidah bin Jarraah (radhiyallahu ‘anhu) is among the people of Jannah.
(Sunan Tirmizi #3747)