When the helmet of the Prophet (ﷺ) was smashed on his head and blood covered his face and one of his front teeth got broken, `Ali brought the water in his shield and Fatima the Prophet's daughter) washed him. But when she saw that the bleeding increased more by the water, she took a mat, burnt it, and placed the ashes on the wound of the Prophet (ﷺ) and so the blood stopped oozing out.
Reference: Sahih al-Bukhari 2903 In-book : Book 56, Hadith 117 USC-MSA web (English) : Vol. 4, Book 52, Hadith 152 (deprecated)
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