Sahih al-Bukhari 4075
صحيح البخاري#4075SahihNarrated Abu Hazim:That he heard Sahl bin Sa`d being asked about the wounds of Allah's Messenger (ﷺ) saying, "By Allah, I know who washed the wounds of Allah's Messenger (ﷺ) and who poured water (for washing them), and with what he was treated." Sahl added, "Fatima, the daughter of Allah's Messenger (ﷺ) used to wash the wounds, and `Ali bin Abi Talib used to pour water from a shield. When Fatima saw that the water aggravated the bleeding, she took a piece of a mat, burnt it, and inserted its ashes into the wound so that the blood was congealed (and bleeding stopped). His canine tooth got broken on that day, and his face was wounded, and his helmet was broken on his head
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 64:120