Sayyiduna Sahl bin Sa'd (may Allah be pleased with him) said: "I was present on the day of Uhud, and I was watching when the face of the Messenger of Allah (peace and blessings be upon him) was struck and he (peace and blessings be upon him) was wounded. And I know who was washing the blood from the face of the Messenger of Allah (peace and blessings be upon him) and who was carrying the water in the shield. The wound would not stop bleeding, until Sayyidah Fatimah (may Allah be pleased with her), the daughter of the Messenger of Allah (peace and blessings be upon him), burned an old mat and put its ashes on the wound, and the bleeding stopped. The one carrying the water in the shield was Sayyiduna Ali bin Abi Talib (may Allah be pleased with him), and Sayyidah Fatimah (may Allah be pleased with her) was washing the blood and treating it."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5690