Musnad Ahmad ibn Hanbal: Book 1, Hadith 19

It was narrated that Talhah bin ‘Abdullah bin ‘Abdur-Rahman bin Abi Bakr as-Siddeeq said: A man among the Ansar who was a man of knowledge told me that he heard ‘Uthman bin ‘Affan (may Allah have mercy on him) narrate that some of the Companions of the Prophet (ﷺ), when the Prophet (ﷺ) died, grieved so much that some of thern were almost unaware of what was going on around them. ‘Uthman said: I was one of them. Whilst I was sitting in the shade of a small fort, ‘Umar passed by me and greeted me, and I did not realise that he had passed me or greeted me, ‘Umar went to Abu Bakr and said to him: Do you think it is right that I passed by ‘Uthman and greeted him and he did not return my greeting? He and Abu Bakr came, when Abu Bakr had been appointed caliph and they both greeted me. Then Abu Bakr said: Your brother ‘Umar came to me and told me that he passed by you and greeted you but you did not return his greeting; what made you do that? I said: I did not do that. ‘Umar said: Yes, by Allah, you did that, but you have too much pride, O Banu Umayyah. I said: By Allah, I did not realise that you had passed me or greeted me. Abu Bakr said: ‘Uthman is telling the truth; is something bothering you? I said: Yes. He said: What is it? ‘Uthman said: Allah, may He be glorifică and exalted, has caused His Prophet (ﷺ) to die before we could ask him how we can save ourselves, Abu Bakr said: I asked him about that. (‘Uthman] said: I went to him and said: May my father and mother be sacrificed for you, you were more deserving to ask it. Abu Bakr said: I said:O Messenger of Allah, what is salvation? The Messenger of Allah (ﷺ) said: “Whoever accepts this word from me that I asked my uncle to say but he rejected it, it is salvation for him.`