He was being asked about the wound of the Messenger of Allah ﷺ, so he said, "By Allah, I know who washed the wound of the Messenger of Allah, who poured the water, and what was used to treat it. Fatimah, peace be upon her, the daughter of the Messenger of Allah ﷺ, was washing it, while Ali poured the water with a shield. When Fatimah saw that the water was only making the bleeding worse, she took a piece of a straw mat, burned it, and pressed it against the wound, and the bleeding stopped. On that day his front tooth was broken, his face was wounded, and the helmet was shattered upon his head."
- وهو يسأل عن جرح رسول الله ﷺ فقال: أما والله إني لأعرف من كان يغسل جرح رسول الله وكان يسكب الماء، وبما دووي، قال: كانت فاطمة عليها السلام بنت رسول الله ﷺ تغسله، وعلي يسكب الماء بالمجن، فلما رأت فاطمة أن الماء لا يزيد الدم إلا كثرة، أخذت قطعة من حصير فأحرقتها وألصقتها، فاستمسك الدم، وكسرت رباعيته يومئذ، وجرح وجهه، وكسرت البيضة على رأسه.
Bukhari narrated it in the Book of Military Expeditions (4075), and Muslim in the Book of Jihad and Expeditions (1790:102), both from Qutayba bin Saeed, who said, Yaqub (that is, Ibn Abdul-Rahman al-Qari) narrated to us, from Abu Hazim, that he heard Sahl bin Saad say, and then he related it.