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 face was
wounded, and his helmet was broken on his head."
Sahih al-Bukhari Book 64, Hadith 120