Narrated Abu Ad-Darda:
There was a dispute between Abu Bakr and 'Umar, and Abu Bakr made Umar angry. So 'Umar left angrily. Abu Bakr followed him, requesting him to ask forgiveness (of Allah) for him, but 'Umar refused to do so and closed his door in Abu Bakr's face. So Abu Bakr went to Allah's Apostle while we were with him. Allah's Apostle ﷺ said, "This friend of yours must have quarrelled (with somebody)." In the meantime 'Umar repented and felt sorry for what he had done, so he came, greeted (those who were present) and sat with the Prophet and related the story to him. Allah's Apostle became angry and Abu Bakr started saying, "O Allah's Apostle! By Allah, I was more at fault (than Umar)." Allah's Apostle ﷺ said, "Are you (people) leaving for me my companion? (Abu Bakr), Are you (people) leaving for me my companion? When I said, 'O people I am sent to you all as the Apostle of Allah,' you said, 'You tell a lie.' while Abu Bakr said, 'You have spoken the truth ."
• Sahih al-Bukhari, Vol. 6, Book of Prophetic Commentary on the Qur'an, Hadith 164
• Sahih al-Bukhari, Book of Prophetic Commentary on the Qur'an, Hadith 164