Musnad Ahmad ibn Hanbal: Book 4, Hadith 18

It was narrated that Humran said, `Uthman (رضي الله عنه) called for water when he was in al-Maqa`id. He poured some on his right hand and washed it, then he put his right hand in the vessel and washed his hands three times, then he washed his face three times, and he rinsed his mouth and nose, he washed his arms up to the elbows three times, then he wiped his head, then he washed his feet up to the ankles three times. Then he said: `Uthman (رضي الله عنه) looked out from the house when he was under siege and said: I adjure by Allah anyone who was present with the Messenger of Allah (ﷺ) , on the day of Hira`, when the mountain shook beneath his feet; he kicked it with his foot and said: “Be still, Hira`, there is no one on you but a Prophet, a Siddiq or a martyr,` and i was with him. And some men testified to what he said. Then he said: I adjure by Allah anyone who was present with the Messenger of Allah (ﷺ) on the day of Bai’atul-Ridwan, when he had sent me to the mushrikeen, the people of Makkah; he said, `This is my hand and this is the hand of `Uthman,` and he swore allegiance on my behalf. And some men testified to what he said. Then he said:l adjure by Allah anyone who was present when the Messenger of Allah (ﷺ) said: `Who will expand the mosque by incorporating this house into it, in return for a house in Paradise?” and I bought it with my wealth and expanded the mosque by incorporating it into it. And some men testified to what he said. Then he said: I adjure by Allah anyone who saw the Messenger of Allah (ﷺ) on the day of the army of hardship (i.e., Tabook), when he said: `Who will spend today a spending that will be accepted by Allah?` and I equipped half of the army with my wealth. And some men testified to what he said, Then he said:I adjure by Allah anyone who saw the water of Roomah (a well) being sold to wayfarers, then I bought it with my own wealth and gave it to wayfarers for free.` And some men testified to what he said.