Hazrat Abdullah bin Abbaas (radhiyallahu ‘anhuma) mentions:
I was present on the occasion when the body of Hazrat Umar (radhiyallahu ‘anhu) was placed on the bier after his martyrdom. People began to throng around his body. While waiting for his body to be raised and taken for burial, they were reciting durood upon Rasulullah (sallallahu ‘alaihi wasallam) and making dua for Hazrat Umar (radhiyallahu ‘anhu).
Suddenly, I found a person behind me holding onto my shoulder. When I turned to see who it was, I saw that it was none other than Hazrat Ali (radhiyallahu ‘anhu).
While looking at the body of Hazrat Umar (radhiyallahu ‘anhu), he said, “O Umar! May Allah Ta‘ala shower His special mercy on you!” He then said, “At this time, there is no person whose actions are more beloved to me, and with which I wish to meet Allah Ta‘ala, more than your actions! I take an oath by Allah! I have conviction that Allah Ta‘ala will join you with your two companions, Rasulullah (sallallahu ‘alaihi wasallam) and Hazrat Abu Bakr (radhiyallahu ‘anhu).
“Throughout your life, you always remained with Rasulullah (sallallahu ‘alaihi wasallam) and Hazrat Abu Bakr (radhiyallahu ‘anhu). Hence, I would often hear Nabi (sallallahu ‘alaihi wasallam) saying, ‘I went to a certain certain place with Abu Bakr and Umar. I entered a certain place with Abu Bakr and Umar. I left a certain place with Abu Bakr and Umar.’” (Saheeh Bukhaari #3685)