Mention of whoever is saved from three things is truly saved

It is narrated from Sayyiduna Abdullah bin Hawalah al-Asadi (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever is saved from three tribulations has (truly) been saved." The Companions said: "O Messenger of Allah (peace and blessings be upon him)! What are they?" He (peace and blessings be upon him) said: "My death, the killing of a caliph who remains steadfast upon the truth and gives people their rights, and the tribulation of the Dajjal."
This hadith has a sahih chain, but the two Shaykhs did not record it.

It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The millstone of Islam will turn (in the whirlpool of tribulations) after thirty-five, thirty-six or thirty-seven years. If they perish, it will be the path of those who perished; and if their religion remains for them, it will stand for seventy years." Sayyiduna Umar (may Allah be pleased with him) said: "O Prophet of Allah (peace and blessings be upon him)! Is this period counted from the years that have passed or from those that remain?" He (peace and blessings be upon him) said: "No, rather from those that remain."
This hadith is sahih on the condition of Imam Muslim, and in it is a clear statement about the martyrdom of Sayyiduna Uthman (may Allah be pleased with him), as I mentioned earlier that the date of his martyrdom is the year 35 AH.

It is narrated from Mus'ab bin Abdullah al-Zubayri that al-Walid bin Uqbah bin Abi Mu'ayt bin Amr bin Umayyah bin Abd Shams was the brother of Sayyiduna Uthman (may Allah be pleased with him) through his mother. The mother of both of them was Arwa bint Kurayz bin Rabi'ah bin Abd Shams, and Arwa's mother was Umm Hakim al-Bayda' bint Abd al-Muttalib bin Abd Manaf, who was the paternal aunt of the Messenger of Allah (peace and blessings be upon him). The Prophet (peace and blessings be upon him) had Uqbah bin Abi Mu'ayt killed on his return (from the Battle of Badr), while al-Walid was a grown man (adult) in the blessed era of the Messenger of Allah (peace and blessings be upon him), and his kunyah was Abu Wahb.

It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Tonight a righteous man was shown in a dream that Abu Bakr was joined to the Messenger of Allah, Umar was joined to Abu Bakr, and Uthman was attached to Umar." (Jabir (may Allah be pleased with him) said:) When we got up from the presence of the Messenger of Allah (peace and blessings be upon him), we said among ourselves that the "righteous man" is the Messenger of Allah (peace and blessings be upon him) himself, and as for the mention of their being joined one to another, it means that these are the ones who will be the guardians of this matter of the caliphate with which Allah sent His Prophet (peace and blessings be upon him).
Imam al-Darimi says: I heard Yahya bin Ma'in say that Muhammad bin Harb narrates this hadith with a connected chain (musnad), whereas others narrate it from Imam al-Zuhri as mursal; and (in the chain) this is Umar bin Aban, because none of the sons of Aban bin Uthman was named Amr.

It is narrated from Sayyiduna Murrah bin Ka'b (may Allah be pleased with him); he said: I heard the Messenger of Allah (peace and blessings be upon him) mention a tribulation, telling of its nearness. Meanwhile a man passed by who had covered his head with a cloth, and he (peace and blessings be upon him) said: "This man will be upon guidance on that day (at the time of the tribulation)." So I got up and went to the man, and it was Sayyiduna Uthman bin Affan (may Allah be pleased with him). I turned his face (towards the Prophet (peace and blessings be upon him)) and asked: "Is this the man?" He (peace and blessings be upon him) said: "Yes."
This hadith is sahih on the condition of Imam Bukhari and Imam Muslim, but the two Shaykhs did not record it.