The Messenger of Allah (peace and blessings be upon him) informing Uthman (may Allah be pleased with him) in a dream on the day of his martyrdom

It is narrated from Kathir bin al-Salt that on the day Sayyiduna Uthman bin Affan (may Allah be pleased with him) was martyred, he dozed off a little. When he woke up, he said: "Were I not afraid that people would say that Uthman wished for tribulation, I would tell you something." We said: "May Allah set you right, do tell us; we will not say what people say!" So he said: "I have just seen the Messenger of Allah (peace and blessings be upon him) in my dream, and he (peace and blessings be upon him) said (to me): 'You will surely spend the coming Friday with us.'"
This hadith has a sahih chain, but the two Shaykhs did not record it.

It is narrated from Sayyidah Aishah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "Call one of my Companions to me (or he said: I wish one of my Companions were with me)." I said: "Abu Bakr?" He (peace and blessings be upon him) said: "No." I said: "Umar?" He (peace and blessings be upon him) said: "No." I said: "Your cousin Ali?" He (peace and blessings be upon him) said: "No." I said: "Then Uthman?" He (peace and blessings be upon him) said: "Yes." The narrator said: So Sayyiduna Uthman came, and he (peace and blessings be upon him) said (to me): "Get up (and leave)." Then the Prophet (peace and blessings be upon him) began to speak privately to Sayyiduna Uthman (may Allah be pleased with him), and Uthman's colour began to change. The narrator said: Then when the Day of the House (the day of Sayyiduna Uthman's siege) came, we said: "Will you not fight (these rebels)?" He said: "No, for the Messenger of Allah (peace and blessings be upon him) took a covenant from me, and I am holding myself patiently to it."
This hadith has a sahih chain, but the two Shaykhs did not record it.

It is narrated from Sayyidah Aishah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said to Sayyiduna Uthman (may Allah be pleased with him): "O Uthman! Indeed Allah Almighty will clothe you in a shirt (the caliphate), so if the hypocrites want to force you to take it off, do not take it off at all."
This hadith has a sahih chain, but the two Shaykhs did not record it.

It is narrated from Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) that he said on the pulpit: I saw in a dream as though a rooster pecked me three pecks (or he said: pecked me three times), so I said: "This is an a'jami (a non-Arab)." And I have entrusted this matter of the caliphate after me to these six men with whom the Messenger of Allah (peace and blessings be upon him) was pleased at the time of his death: Uthman, Ali, Talhah, al-Zubayr, Abd al-Rahman and Sa'd (may Allah be pleased with them).
This hadith has a sahih chain, but the two Shaykhs did not record it.
An account of the martyrdom of the Commander of the Faithful, Sayyiduna Uthman bin Affan (may Allah be pleased with him). The first thing of which a scholar may not be ignorant is knowing the cause of what happened to him: namely, the affair of Abdullah bin Sa'd bin Abi Sarh, who was the maternal cousin of Sayyiduna Uthman, and the affair of al-Walid bin Uqbah bin Abi Mu'ayt, who was his brother through his mother. As for Abdullah bin Sa'd bin Abi Sarh, the authentic reports state that he was a scribe of the Messenger of Allah (peace and blessings be upon him); then his breaches of trust in the writing became apparent, so the Messenger of Allah (peace and blessings be upon him) dismissed him, whereupon he apostatised and went off to Makkah. The Messenger of Allah (peace and blessings be upon him) had declared his blood lawful on the day of the Conquest of Makkah, but he was not killed until Sayyiduna Uthman (may Allah be pleased with him) brought him (after he had returned to Islam), so the Messenger of Allah (peace and blessings be upon him) granted him safety and spared his blood.