Sahih al-Bukhari 2911

Narrated Sahl:That he was asked about the wound of the Prophet (ﷺ) on the day (of the battle) of Uhud. He said, "The face of the Prophet (ﷺ) was wounded and one of his front teeth was broken and the helmet over his head was smashed. Fatima washed off the blood while `Ali held water. When she saw that the bleeding was increasing continuously, she burnt a mat (of date-palm leaves) till it turned into ashes which she put over the wound and thus the bleeding ceased