It is narrated from Abu Salamah bin Abdur Rahman that when Sayyiduna Uthman (may Allah be pleased with him) was besieged, he looked down from the top of the house and said: O people! I ask you by Allah, is there anyone among you who was present at that time when the Messenger of Allah (peace and blessings be upon him) was on Hira, and the mountain began to shake, and the Prophet (peace and blessings be upon him) struck his blessed foot on the mountain and said: O Hira! Be still, for only a Prophet, a Siddiq, or a martyr is upon you. At that time, I was with the Prophet (peace and blessings be upon him). Many people affirmed this. Then Sayyiduna Uthman (may Allah be pleased with him) said: I ask, by Allah, that person who was present on the day of the Pledge of Ridwan, and the Messenger of Allah (peace and blessings be upon him) sent me as an envoy to the polytheists of Makkah, and while taking and giving the pledge, the Prophet (peace and blessings be upon him) said: This is my hand and this is Uthman's hand, meaning he took the pledge on my behalf. Many people affirmed this as well. Then Sayyiduna Uthman (may Allah be pleased with him) said: I ask, by Allah, that person who was present with the Messenger of Allah (peace and blessings be upon him) at that time when he said: Who is there who will buy the house next to the mosque and include it in the mosque, and in return he will get a house in Paradise? So I bought that place with my personal wealth and expanded the mosque. Many people affirmed this claim as well. Then Sayyiduna Uthman (may Allah be pleased with him) said: I ask, by Allah, that person who was present at the time of the army of hardship, i.e., the expedition of Tabuk, when the Prophet (peace and blessings be upon him) said: Who is there who will spend in the way of Allah today, and his deed will be accepted by Allah? So I arranged for half of the army's needs with my personal wealth. Many people affirmed this virtue as well. Then Sayyiduna Uthman (may Allah be pleased with him) asked by Allah: Does anyone know that the water of Rumah was sold to travelers for a price, and I bought it with my personal wealth and dedicated it for the travelers? Many people affirmed this as well.
Hadith Referenceالفتح الربانی / كتاب الخلافة والإمارة / 12273
Benefits: … It is understood from this that Sayyiduna Uthman radi Allahu anhu is a martyr (shaheed), because the Prophet sallallahu alayhi wa sallam foretold his martyrdom.