´Narrated Thumamah bin Hazn Al-Qushairi:` "I was present at the house when 'Uthman appeared above them saying: 'Bring me your two companions who have gathered you against me.'" He said: "So they were brought as if they were two camels, or as if they were two donkeys." He said: "'Uthman appeared above them and said: 'I ask you by Allah and Islam! Do you know that the Messenger of Allah (ﷺ) came to Al-Madinah and there was no water in it that was sweet except the well of Rumah, so the Messenger of Allah (ﷺ) said: 'Who will purchase the well of Rumah and place his bucket alongside the buckets of the Muslims, in exchange for better than that in Paradise?' So I bought it with the core of my wealth, and today you prevent me from drinking from it, so that I would have to drink from the water of the sea?' They said: 'O Allah! Yes!' He said: 'I ask you by Allah and Islam! Do you know that the Masjid, was insufficient for its people, so the Messenger of Allah (ﷺ) said: 'Who will purchase the land of the family of so-and-so, and add it to the Masjid in exchange for better than that in Paradise?' So I bought it with the core of my wealth, and today you prevent me from praying two Rak'ah in it?' They said: 'O Allah! Yes.' He said: 'I ask you by Allah and Islam! Do you know that I prepared the 'army of distress' from my wealth?' They said: 'O Allah! Yes!' Then he said: 'I ask you by Allah and Islam! Do you know that the Messenger of Allah (ﷺ) was on (mount) Thabir of Makkah, and with him was Abu Bakr, and 'Umar, and myself. The mountain began shaking until its rocks fell to its bottom.' He said: 'So he (ﷺ) stomped it with his foot and said: "Be still O Thabir! For there is none upon except a Prophet, a Siddiq and two martyrs?"' They said: 'O Allah! Yes!' He said: 'Allah is Great! Bear witness by the Lord of the Ka'bah that I am a martyr!' - three times."
Hadith Referenceسنن ترمذي / كتاب المناقب عن رسول الله صلى الله عليه وسلم / 3703
´It was narrated that Thumamah bin Hazn Al-Qushairi said:` "I was present at the house when 'Uthman looked out over them and said: 'I adjure you by Allah and by Islam, are you aware that when the Messenger of Allah came to Al-Madinah, and it had no water that was considered sweet (suitable for drinking) except the well of Rumah, he said: "Who will buy the well of Rumah and dip his bucket in it alongside the buckets of the Muslims, in return for a better one in Paradise?" and I bought it with my capital and dipped my bucket into it alongside the buckets of the Muslims? Yet today you are preventing me from drinking from it, so that I have to drink salty water.' They said: 'By Allah, yes.' He said: 'I adjure you by Allah and by Islam, are you aware that I equipped the army of Al-'Usrah (Tabuk) from my own wealth?' They said: 'By Allah, yes.' He said: 'I adjure you by Allah and by Islam, are you aware that when the Masjid became too small for the people and the Messenger of Allah said: Who will buy the plot of the family of so and so and add it to the Masjid, in return for a better plot in Paradise? I bought it with my capital and added it to the Masjid? Yet now you are preventing me from praying two Rak'ahs therein.' They said: 'By Allah, yes.' He said: 'I adjure you by Allah and by Islam, are you aware that when the Messenger of Allah was atop Thabir -the Thabir in Makkah- and with him were Abu Bakr, 'Umar and myself, the mountain shook, and the Messenger of Allah kicked it with his foot and said: Be still, Thabir, for upon you are a Prophet, a Siddiq and two martyrs?' They said: 'By Allah, yes.' He said: 'Allahu Akbar! They have testified for me, by the Lord of the Ka'bah' -i.e., that I am a martyr."
Hafiz Muhammad Ameen
(1) "I will be martyred"—whereas it is an absolute fact that a martyr (shaheed) is one who is wronged, and his killer is at the very least an oppressor. It is as if they themselves are testifying that they will unjustly kill the leader of the Muslims (khalifat al-muslimin).
(2) Drinking sweet water is not contrary to asceticism (zuhd); rather, drinking sweet water and requesting it from someone is permissible. There is no virtue in drinking salty or brackish water, as is the way of some Sufis. Furthermore, from this hadith, the permissibility of consuming delicious foods is established.
(3) "Thubayr" is the mountain that comes on the right side when entering from Makkah to Mina. In this narration, "Thubayr" is mentioned, whereas in the well-known narration, "Mount Uhud" is mentioned, and in some narrations, "Hira" is also mentioned. The likelihood of "Uhud" is stronger. And Allah knows best.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 3638