Once, Abu Bakr appeared in the masjid, walking swiftly, having raised his lower garment so that his shin was visible. Upon seeing him, the Prophet SAW said, 'It appears your companion [meaning Abu Bakr] has been in an argument!'
When he came to the gathering, he greeted the Prophet SAW and said, 'O Messenger of Allah! There was an issue between Umar b. al-Khattab and me, and I got angry [and said some things], but then regretted it. So I asked him to forgive me, but he refused! That is why I came to you.'
The Prophet (SAW) said, 'Allah will forgive you, O Abu Bakr' and repeated it three times.
In the meantime, Umar regretted what had transpired, and went to the house of Abu Bakr, hoping to find him there, but he was not there. So Umar made his way to the masjid, and saw him there. When Umar greeting the Prophet (SAW), the anger from the Prophet's (SAW) face was obvious. After a while, Abu Bakr himself felt pity for Umar, so he half-stood up on his knees and said, 'O Messenger of Allah! By Allah I did more wrong than he did [to me].'
The Prophet (SAW) replied, "Allah sent me to you: while all of you said, 'He lies!', Abu Bakr said, 'He has spoken the truth!' And it is Abu Bakr who has shared with me himself and his wealth [like no other], so will you not leave my Companion (sahibi) alone?!"
So no one ever interfered with Abu Bakr after that. [Reported by al-Bukhari].