Sahih al-Bukhari 3037

'Ali ibn 'Abdullah narrated to us; Sufyan narrated to us; Abu Hazim narrated to us and said: They asked Sahl ibn Sa'd al-Sa'idi (may Allah be pleased with him), ‘What was used to treat the wound of the Prophet (ﷺ)?’ He said: No one remains who knows this better than I do. 'Ali used to bring water in his shield, and Fatima—meaning [the Prophet's daughter]—used to wash the blood from his face. A reed mat was taken, burned, and its ash packed into the wound of the Messenger of Allah (ﷺ).