Narrated Ibn Abbas:

While I was standing amongst the people who were invoking Allah for Umar bin Al-Khattab who was lying (dead) on his bed, a man behind me rested his elbows on my shoulder and said, "(O 'Umar!) May Allah bestow His Mercy on you. I always hoped that Allah will keep you with your two companions, for I often heard Allah's Apostle saying, "I, Abu Bakr and 'Umar were (somewhere). I, Abu Bakr and 'Umar did (something). I, Abu Bakr and 'Umar set out.' So I hoped that Allah will keep you with both of them." I turned back to see that the speaker was Ali bin Abi Talib. - Al-Bukhari Volume 5, Book 57, Number 26

Narrated Ibn Abbas:

When (the dead body of) 'Umar was put on his deathbed, the people gathered around him and invoked (Allah) and prayed for him before the body was taken away, and I was amongst them. Suddenly I felt somebody taking hold of my shoulder and found out that he was 'Ali bin Abi Talib. 'Ali invoked Allah's Mercy for 'Umar and said, "O 'Umar! You have not left behind you a person whose deeds I like to imitate and meet Allah with more than I like your deeds. By Allah! I always thought that Allah would keep you with your two companions, for very often I used to hear the Prophet saying, 'I, Abu Bakr and 'Umar went (somewhere); I, Abu Bakr and 'Umar entered (somewhere); and I, Abu Bakr and Umar went out."' Al-Bukhari

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